Solid Earth Sciences最新文献

筛选
英文 中文
Structural analysis of the Banyo syenitic pluton: Implication for its synkinematic emplacement and correlations to Godé Gormaya and Rocher du Loup shear zones – Related Pan-African N–S syenites Banyo正长岩体的构造分析:与god<s:1> Gormaya和Rocher du Loup剪切带相关的泛非N-S正长岩体的同动侵位及其相关性
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-06-15 DOI: 10.1016/j.sesci.2023.05.003
Noudiédié Kamgang Julie Agathe , Tcheumenak Kouémo Jules
{"title":"Structural analysis of the Banyo syenitic pluton: Implication for its synkinematic emplacement and correlations to Godé Gormaya and Rocher du Loup shear zones – Related Pan-African N–S syenites","authors":"Noudiédié Kamgang Julie Agathe ,&nbsp;Tcheumenak Kouémo Jules","doi":"10.1016/j.sesci.2023.05.003","DOIUrl":"10.1016/j.sesci.2023.05.003","url":null,"abstract":"<div><p>The Banyo Syenitic Pluton (BSP) is located on the south western extension of the Mayo Nolti Shear Zone (MNSZ). It is a NNE-SSW elliptical pluton. On the petrographic view, the BSP displays two rock types namely: hornblende-pyroxene-quartz syenite (HPQS) and hornblende-biotite granite (HBG), intruded in a plutono-metamorphic basement rock consists of biotite granite (BG) and hornblende-biotite gneiss (HBGn). Structural investigations indicate that the study area recorded three deformation phases: D<sub>1</sub>, D<sub>2</sub> and D<sub>3</sub>. D<sub>1</sub> is a flattening phase characterized by WNW-ESE to NNW-SSE (N110°E to N160°E) trending metamorphic foliation (S<sub>1</sub>) with moderate (50°–60°) dips toward NNE to ENE. D<sub>2</sub> trends N–S and is characterized by crenulation cleavages (S<sub>2</sub>), N–S sinistral shear and coeval S<sub>2</sub> foliation in hornblende-biotite gneiss. The emplacement of the HPQS and (HBG) took place during this phase considering the N–S global trend of the entire pluton and the NNE-SSW shape of the HPQS in the one hand and sinistral shear deformation microstructures display by plagioclase and K-feldspar crystals in HPQS. D<sub>3</sub> displays NE–SW (N30E to N45E) trend in HBGn and HPQS. Magnetic data indicate an inward-dipping NNE-SSW concentric pattern around station N32. The NNE-SSW elliptic shape and concentric magnetic foliation trajectories displayed by the BSP indicate its synkinematic emplacement during the D<sub>2</sub> N–S sinistral activation of the MNSZ with the feeder zone (station N32) located on the north eastern border. The sinistral activation is related to the Saharan Metacraton convergence over the Cameroon northern margin. This emplacement was disturbed by an overprinting E–W to NNW-SSE dextral syn-D<sub>3</sub> shear phase probably due to the dominant convergence (during its late stage) of the West African Craton over the Cameroon western border. Structural field data and magnetic fabrics infer that the Banyo syenitic pluton was emplaced in a N–S to NNE-SSW oriented fracture initiated during the transcurrent strike-slip MNSZ. The BSP is intruded in HBGn basement rock whose deformation ages are bracketed between 600 Ma (for the early syn-D<sub>1</sub> deformation structures) and 550 (for the late syn-D<sub>3</sub> deformation structures). The location of the BSP on the N–S to NNE-SSW sinistral MNSZ, between the GGSZ to the north and the RLSZ to the south, displaying similar structural features and N–S syn-to late kinematic syenitic plutons respectively dated at 593 Ma and 590 Ma help in dating the BSP pluton at 593 - 590 Ma. This age range dates several synkinematic emplacements of Pan-African younger syenite and granitoids along N–S and NE–SW shear zones during the western Gondwana post-collisional history.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 2","pages":"Pages 161-187"},"PeriodicalIF":2.0,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41441549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Genesis and exhumation of the Kongur-Muztaghata and Maeryang gneiss domes in NE Pamir since the Mesozoic 帕米尔高原东北中生代以来孔古尔-穆兹塔格塔和梅尔阳片麻岩圆顶的成因及发掘
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-06-15 DOI: 10.1016/j.sesci.2023.04.001
Zhiqin Xu , Bihai Zheng , Shaocheng Ji , Zhihui Cai , Hui Cao , Guangwei Li , Xijie Chen , Hua Xiang , Fenghua Liang
{"title":"Genesis and exhumation of the Kongur-Muztaghata and Maeryang gneiss domes in NE Pamir since the Mesozoic","authors":"Zhiqin Xu ,&nbsp;Bihai Zheng ,&nbsp;Shaocheng Ji ,&nbsp;Zhihui Cai ,&nbsp;Hui Cao ,&nbsp;Guangwei Li ,&nbsp;Xijie Chen ,&nbsp;Hua Xiang ,&nbsp;Fenghua Liang","doi":"10.1016/j.sesci.2023.04.001","DOIUrl":"10.1016/j.sesci.2023.04.001","url":null,"abstract":"<div><p>The Kongur-Muztaghata-Maeryang terrane in NE Pamir is considered to be the western extension of the Songpan-Ganze terrane located in the northern Tibetan Plateau. The Kongur-Muztaghata gneiss dome (KMGD) is situated in the north while the Maeryang gneiss dome (MYGD) is in the south. The KMGD comprises Triassic granites and granitic gneiss in the core and Early Paleozoic-Triassic sediments in the mantle that underwent Barrovian-type and Buchan-type metamorphisms. Based on geochemical and geochronological data, the Kongur-Muztaghata magmatic arc was formed around ∼252–204 Ma due to northward subduction of the Paleo-Tethys Jinsha oceanic slab. The collision of the Kongur-Muztaghata magmatic arc and the Qiangtang terrane occurred subsequently. Previous research suggested that the KMGD was formed in the Miocene (21–8 Ma). However, our new in-situ monazite U–Pb data for the mantled metasediment shows that the KMGD was initially formed at ∼198 Ma.</p><p>The MYGD is comprised of an Early Paleozoic-Triassic metasediment mantle and a Cambrian anatexis complex core that underwent Barrovian-Buchan metamorphisms. Our new structural, geochemical, and geochronological data suggest that the protolith of the Maeryang orthogneiss was formed around ∼519-513 Ma, with the surrounding Early Paleozoic metavolcanic rocks erupted at ∼519-508 Ma. Together, they formed the Early Cambrian magmatic complex. In-situ U–Pb dating of monazites and zircon metamorphic rims for the Triassic metamorphic rocks in the mantle indicate that the Barrovian-Buchan metamorphism in the MYGD occurred around ∼206-187 Ma, likely caused by anatexis in the deep crust of the gneiss dome core. Thus, we propose that the KMGD and MYGD underwent a two-stage exhumation: the initial uplift during the Late Triassic-Early Jurassic thermo-tectonic event associated with the Cimmerian orogeny and the late rapid exhumation since the Miocene driven by the collision between the Eurasian and Indian plates.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 2","pages":"Pages 123-145"},"PeriodicalIF":2.0,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45310521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A study on the effects of fault architecture on fluid circulation in the Gediz Graben by the finite volume method 用有限体积法研究断层构造对格迪兹地堑流体循环的影响
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-06-15 DOI: 10.1016/j.sesci.2023.05.001
D. Dusunur Dogan
{"title":"A study on the effects of fault architecture on fluid circulation in the Gediz Graben by the finite volume method","authors":"D. Dusunur Dogan","doi":"10.1016/j.sesci.2023.05.001","DOIUrl":"10.1016/j.sesci.2023.05.001","url":null,"abstract":"<div><p>It is widely recognized that in geothermal fields, meteoric water infiltrates deep into the subsurface of the earth and then travels through cracks and fractures, returning to the surface as it becomes heated. The patterns of fluid flow are primarily determined by the interaction between forces driven by gravity and pressure gradients. The ultimate forms of fluid flow patterns are primarily determined by the anisotropies of permeability associated with fault zones. In this study, a series of numerical simulations utilizing the finite volume approach were conducted to investigate the effects of fault zone architecture on fluid flow patterns and temperature distributions. Four distinct types of fault zone architecture were created in the simulations, including localized barrier, combined conduit-barrier, localized conduit, and distributed conduit. The results revealed that fault zone architecture has only a minor effect on fluid flow velocities and temperature distributions, except in cases along faults with very high permeabilities. The simulations suggest that this type of 2-D numerical modeling can be easily applied and utilized in other faulted geothermal systems.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 2","pages":"Pages 146-159"},"PeriodicalIF":2.0,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41858740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Provenance of clastic sediments: A case study from Cameroon, Central Africa 碎屑沉积物的来源:以中非喀麦隆为例
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-06-15 DOI: 10.1016/j.sesci.2023.03.002
Victorine Ambassa Bela , Armel Zacharie Ekoa Bessa , John S. Armstrong-Altrin , Francis Aonsi Kamani , Estelle Diane Biami Nya , Gabriel Ngueutchoua
{"title":"Provenance of clastic sediments: A case study from Cameroon, Central Africa","authors":"Victorine Ambassa Bela ,&nbsp;Armel Zacharie Ekoa Bessa ,&nbsp;John S. Armstrong-Altrin ,&nbsp;Francis Aonsi Kamani ,&nbsp;Estelle Diane Biami Nya ,&nbsp;Gabriel Ngueutchoua","doi":"10.1016/j.sesci.2023.03.002","DOIUrl":"10.1016/j.sesci.2023.03.002","url":null,"abstract":"<div><p>The provenance of clastic sediments in stream beds, river terraces, rivers, swamps, lakes and beaches from different geological settings was investigated based on their compositional and geochemical variations. The geochemistry data of 622 sediment samples from 22 sites in the Cameroon were compiled to infer the provenance. The results suggest that, their mineralogy is dominated by quartz, low amount of feldspars, clay minerals, heavy minerals, ferric minerals, and rock fragments. The SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratio indicate that the sediments of Cameroonian region are mostly rich in quartz and clay-minerals. The enrichment of K<sub>2</sub>O/Na<sub>2</sub>O ratio implies plagioclase disintegration as K-feldspar during weathering and/or K-reintroduction in the system during diagenesis. The sediments are rich in light rare earth elements (LREE) and classified as shale, Fe-shale, Fe-sand, wacke, arkose, litharenite, sublitharenite, and quartzarenite. The sediments are composed of detritus derived from felsic igneous rocks, which correspond to the geology of the source areas. Weathering indices such as chemical index of alteration (CIA), chemical index of weathering (CIW), plagioclase index of alteration (PIA) and, A–CN–K (A=Al<sub>2</sub>O<sub>3</sub>, CN=CaO∗ + Na<sub>2</sub>O, K=K<sub>2</sub>O) plot indicated that the source rocks are subjected to low, moderate and intense weathering.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 2","pages":"Pages 105-122"},"PeriodicalIF":2.0,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48197979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Occurrence of niobium in biotite-type Fe-REE-Nb ore in the Bayan Obo deposit 白云鄂博矿区黑云母型Fe-REE-Nb矿中铌的赋存状态
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-03-15 DOI: 10.1016/j.sesci.2023.01.002
Yisu Ren , Xiaoyong Yang , Xiaoxia Wang
{"title":"Occurrence of niobium in biotite-type Fe-REE-Nb ore in the Bayan Obo deposit","authors":"Yisu Ren ,&nbsp;Xiaoyong Yang ,&nbsp;Xiaoxia Wang","doi":"10.1016/j.sesci.2023.01.002","DOIUrl":"10.1016/j.sesci.2023.01.002","url":null,"abstract":"<div><p>The Bayan Obo REE-Nb-Fe deposit, which reserves the current largest REE resources globally, also hosts 63.4% of China's Nb resources. Previous studies mainly focus on the isotopes and petrographic mineralogy of carbonatite dyke, ore-host dolomite and rare earth ore in Bayan Obo deposit, niobium mineralogy is comparatively insufficient. In order to promote the utilization of niobium resources in the Bayan Obo deposit, we focus on the petrological and mineralogical study on the biotite-type Fe-REE-Nb ore of West Mine, by scanning electron microscope (SEM), X-ray energy spectrum (EDX) imaging and micro-XRF scan. From the analysis, we observe that 1) this type of ore shows relative enrichment in niobium, and the size of niobium-bearing minerals up to 1 mm; 2) the niobium mineral composition are extremely complex, with main niobium minerals including aeschynite, fergusonite and columbite and minor niobium minerals ilmenorutile and baotite; 3) REEs are mainly distributed in monazite, bastnaesite and aeschynite and the particle size of the first two is relatively fine; 4) aeschynite occurring as large aggregates maybe the hydrothermal in origin and fluid–rock interaction leads to the aggregation of biotite and the precipitation of niobium-bearing minerals. This study on biotite type Fe-REE-Nb ore has important insights for mineral processing and directive significance on niobium prospecting in the Bayan Obo deposit.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 1","pages":"Pages 25-28"},"PeriodicalIF":2.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48162510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Geoelectrical, Hydrogeological and Hydrochemical Investigations of the University of Calabar Campus (SE Nigeria): Implications for sustainable groundwater development 卡拉巴尔大学校园(尼日利亚东南部)的地电、水文地质和水化学调查:对地下水可持续开发的影响
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-03-15 DOI: 10.1016/j.sesci.2022.07.003
Aniekan Edet, Ebenezer A. Kudamnya, Azubuike S. Ekwere
{"title":"Geoelectrical, Hydrogeological and Hydrochemical Investigations of the University of Calabar Campus (SE Nigeria): Implications for sustainable groundwater development","authors":"Aniekan Edet,&nbsp;Ebenezer A. Kudamnya,&nbsp;Azubuike S. Ekwere","doi":"10.1016/j.sesci.2022.07.003","DOIUrl":"10.1016/j.sesci.2022.07.003","url":null,"abstract":"<div><p>The rapid increase in population and infrastructural development has triggered unplanned groundwater development leading to severe stress on groundwater couple with several unsuccessful boreholes or failure of existing in the University of Calabar, Calabar (Nigeria). Hence, an integrated hydrogeological study was undertaken in the university using vertical electrical sounding (VES), to delineate and characterise aquifers and assess the groundwater quality for drinking and irrigation uses, in addition to evolution and human health risk assessment. The results reveal two water bearing units. The first is composed of medium-coarse-gravelly sand with thickness and resistivity in the range 3.6–118.8 m and 540–3500 Ω m, while the second underlying the first aquifer is composed of clayey, fine-medium sand with resistivity and thickness values in the range 44–2200 Ω m and 50 - α. Aquifer parameters from VES and pumping tests showed average hydraulic conductivity (K) and transmissivity (T) of 180 m/day and 25,740 m<sup>2</sup>/day for the first aquifer and 180 m/day and 21,384 m<sup>2</sup>/day for the second aquifer. Regionally, the groundwater flow in the university occurs toward the south. Hydrochemical data show that all the physical parameters, major and minor ions, trace and rare earth elements are within the maximum acceptable limits for drinking and agricultural uses. The dominant hydrochemical facies are Na<sup>+</sup>-Ca<sup>2+</sup>-Cl<sup>-</sup>-SO<sub>4</sub><sup>2-</sup>, Mg<sup>2+</sup>-Ca<sup>2+</sup>-HCO<sub>3</sub><sup>-</sup>-Cl<sup>-</sup> and Ca<sup>2+</sup>-Mg<sup>2+</sup>-HCO<sub>3</sub><sup>-</sup>-Cl<sup>-</sup> with silicate weathering, ion exchange and reverse ion exchange as the major processess controlling the groundwater chemistry. Health risk of water through oral (drinking) and dermal (bathing) pathways showed that values of hazard quotients (HQs) and hazard index (HI) of all the trace elements (Al, As, Cd, Co, cr, Cu, Fe, Mn, Ni, Pb, Zn) were less than one. This suggests that these elements does not pose any adverse risks to the local people through drinking and bathing, but children are more sensitive than adults. This study will serve as a guide for future sustainable development and management of groundwater resource in the university and its environs.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 1","pages":"Pages 86-101"},"PeriodicalIF":2.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44882136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High light REE enrichments in weathering crust in the Huangmeijian alkaline pluton in Luzong Volcanic Basin: A potential exploration target for ion-adsorption rare earth element deposit 陆宗火山盆地黄梅尖碱性岩体风化壳高富集轻稀土元素:离子吸附型稀土元素矿床的潜在勘探目标
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-03-15 DOI: 10.1016/j.sesci.2023.01.001
Xiaoning Kang , Zhuang Zhao , Xiaoyong Yang , Qiyao Liu
{"title":"High light REE enrichments in weathering crust in the Huangmeijian alkaline pluton in Luzong Volcanic Basin: A potential exploration target for ion-adsorption rare earth element deposit","authors":"Xiaoning Kang ,&nbsp;Zhuang Zhao ,&nbsp;Xiaoyong Yang ,&nbsp;Qiyao Liu","doi":"10.1016/j.sesci.2023.01.001","DOIUrl":"10.1016/j.sesci.2023.01.001","url":null,"abstract":"<div><p>The high light rare earth elements contents (up to 412 ppm) in the weathering crust over the REE industrial grade were observed in the Huangmeijian alkaline pluton of the Luzong Volcanic Basin, firstly revealing the mineralization potential of ion-adsorption rare earth elements deposit in central Anhui Province.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 1","pages":"Pages 29-33"},"PeriodicalIF":2.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44645147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Geological setting, tectonic evolution and spatio-temporal distributions of main mineral resources in South East Asia: A comprehensive review 东南亚主要矿产资源的地质背景、构造演化与时空分布
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-03-15 DOI: 10.1016/j.sesci.2022.12.003
Dan Wang , Fangcheng Lin , Meifeng Shi , Hong Wang , Xiaoyong Yang
{"title":"Geological setting, tectonic evolution and spatio-temporal distributions of main mineral resources in South East Asia: A comprehensive review","authors":"Dan Wang ,&nbsp;Fangcheng Lin ,&nbsp;Meifeng Shi ,&nbsp;Hong Wang ,&nbsp;Xiaoyong Yang","doi":"10.1016/j.sesci.2022.12.003","DOIUrl":"10.1016/j.sesci.2022.12.003","url":null,"abstract":"<div><p>Based on results of geological survey and mineral resources research over the past decades, the authors have systematically summarized the metallogenic geologic settings of Laos, Cambodia, Vietnam, Thailand, Myanmar, Malaysia, Indonesia, and the Philippines in Southeast Asia. Mineral geological database has been established, regional geological maps, geotectonic units with division maps, magmatic rock distribution maps and metallogenic regularities of some important metallogenic belts in Southeast Asia have been compiled. The distribution characteristics of major minerals such as copper, gold, aluminum, potassium, nickel, chromium, tungsten and tin, lead and zinc, iron, manganese and antimony, and the genetic types of these minerals are summarized. Meanwhile, twenty metallogenic belts are divided and nine main metallogenic epochs are summarized. We also analyze the influence of the tectonic evolution of the East Tethys, as well as the subduction and collision between the Indian-Australian plate, the Pacific plate, the Philippine sub-plate and the Eurasian plate on the mineralization in Southeast Asia. This study provides a number of valuable data and geological information for understanding the spatial distribution and temporal evolution of minerals, and the prospecting targets in Southeast Asia.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 1","pages":"Pages 34-48"},"PeriodicalIF":2.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41766993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Identification of the first Caledonian A-type granitoids in the southern Qin-Hang belt of south China: Tectonic link to early Paleozoic extension 秦航带南部加里东期a型花岗岩类的识别:与早古生代伸展的构造联系
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-03-15 DOI: 10.1016/j.sesci.2022.12.001
Liuyun Ouyang , Wenting Huang , Jing Wu , Juan Liao , Jian Zhang , Xilian Chen , Huaying Liang
{"title":"Identification of the first Caledonian A-type granitoids in the southern Qin-Hang belt of south China: Tectonic link to early Paleozoic extension","authors":"Liuyun Ouyang ,&nbsp;Wenting Huang ,&nbsp;Jing Wu ,&nbsp;Juan Liao ,&nbsp;Jian Zhang ,&nbsp;Xilian Chen ,&nbsp;Huaying Liang","doi":"10.1016/j.sesci.2022.12.001","DOIUrl":"10.1016/j.sesci.2022.12.001","url":null,"abstract":"<div><p>Evolution of the late Ordovician–Silurian Caledonian orogeny (ca. 460–420 Ma) in the South China Block (SCB) remains controversial due to the overprinting Triassic (Indosinian) and Jurassic-Cretaceous (Yanshanian) orogenic tectonics and the absence of enough petrologic records. This work reported a systematic study of whole-rock geochemistry, zircon U–Pb geochronology and Hf isotopes of the first Caledonian A-type granitoids (Dishui) in Jinxiu county, Guangxi (SW China). The Dishui granitoids are tectonically located in the southwestern Qin-Hang suture belt, which is the largest ancient orogenic belt formed by the collision of the Yangtze and Cathaysia blocks in South China. The Dishui granitoids consist primarily of a syenogranite pluton with a small-scale granodiorite porphyry dike. The Dishui syenogranite and granodiorite porphyry have LA-ICP-MS zircon U–Pb ages of 437.9 ± 1.0 Ma (MSWD = 0.77) and 436.6 ± 0.8 Ma (MSWD = 1.7), respectively. The syenogranite has high contents of SiO<sub>2</sub> (73.20–77.35 wt.%), total alkalis (Na<sub>2</sub>O + K<sub>2</sub>O = 7.42–8.99 wt.%), total REE (198–445 ppm), high field strength elements (HFSEs: Zr + Nb + Ce + Y = 253–520 ppm), and 10,000∗Ga/Al (2.93–3.11) and FeO<sub>t</sub>/(FeO<sub>t</sub> + MgO) (0.77–0.96) ratios and high F concentration, resembling highly-fractionated A-type granite. The granodiorite porphyry displays similar A-type granite affinities, including high (Zr + Nb + Ce + Y) (410–485 ppm), 10,000∗Ga/Al (2.47–4.59), and zircon saturation temperature (T<sub>Zr</sub> = 908–927 °C), medium to high SiO<sub>2</sub> (64.56–64.95 wt.%), Fe<sub>2</sub>O<sub>3</sub> (7.70–8.11 wt.%), and MgO (3.69–4.09 wt.%), and low FeO<sub>t</sub>/(FeO<sub>t</sub> + MgO) (0.61–0.64), resembling magnesian unfractionated A-type granitoid. The Dishui syenogranite and granodiorite porphyry dike have zircon ε<sub>Hf</sub>(t) value and two-stage model age (T<sub>DM2</sub>) of −3.9 to +1.5 and 1.32–1.66 Ga, and −1.7 to +11.8 and 0.94–1.53 Ga, respectively, both much more depleted than many Caledonian gneissic/massive granites and the Devonian A-type granites (ε<sub>Hf</sub>(t) = −14.9 to −3.5) in South China. All these data suggest that the Dishui syenogranite was derived from partial melting of the Proterozoic metamorphic basement with mantle-derived melt input, and the magma subsequently underwent extensive fractionation. Meanwhile, the Dishui granodiorite porphyry was likely derived from the same crustal melt with more mantle-derived input. New ages of the Dishui A-type granitoids (ca. 436–437 Ma) in the Qin-Hang belt indicate a tectonic transition from syn-collisional crustal thickening to post-collisional extension at ∼437 Ma in South China.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 1","pages":"Pages 68-85"},"PeriodicalIF":2.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45266185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Quantifying common major and minor elements in minerals/rocks by economical desktop scanning electron microscopy/silicon drift detector energy-dispersive spectrometer (SEM/SDD-EDS) 经济台式扫描电镜/硅漂移检测器能量色散光谱仪(SEM/SDD-EDS)定量矿物/岩石中常见的主要和次要元素
IF 2 4区 地球科学
Solid Earth Sciences Pub Date : 2023-03-15 DOI: 10.1016/j.sesci.2022.12.002
Yuying Chen , Yi Chen , Qiong Liu , Xi Liu
{"title":"Quantifying common major and minor elements in minerals/rocks by economical desktop scanning electron microscopy/silicon drift detector energy-dispersive spectrometer (SEM/SDD-EDS)","authors":"Yuying Chen ,&nbsp;Yi Chen ,&nbsp;Qiong Liu ,&nbsp;Xi Liu","doi":"10.1016/j.sesci.2022.12.002","DOIUrl":"10.1016/j.sesci.2022.12.002","url":null,"abstract":"<div><p>Earth and planetary sciences require extensive microanalyses to quantify most common major and minor elements O, Na, Mg, Al, Si, K, Ca, Ti, Cr, Mn, Fe and Ni in minerals/rocks. With O usually calculated, this is frequently done with expensive electron probe X-ray microanalyzer using a wavelength dispersive method (WDS), and much less so with expensive ground-based scanning electron microscope (SEM) equipped with an energy-dispersive X-ray spectrometer (EDS). Both instruments are not readily accessible to many scientists though. Here we selected eight natural minerals, containing those elements to various amounts, to test the performance of an economical desktop SEM attached with an EDS consisting of just one 10 mm<sup>2</sup> silicon drift detector (SDD). The compositions of the minerals were established by extensive electron probe X-ray microanalyses (EPMA)-WDS conducted under routine analytical conditions. They were used to evaluate the performance of the desktop SEM/SDD-EDS system. The examination shows that under modest analytical conditions it can generate accurate results for those elements, with detection limits (∼0.1 wt%) much comparable to routine WDS analyses. Therefore, economical desktop SEM/SDD-EDS system can be an affordable and widely-accessible instrument for extensive and accurate quantification of those most common major and minor elements in minerals/rocks.</p></div>","PeriodicalId":54172,"journal":{"name":"Solid Earth Sciences","volume":"8 1","pages":"Pages 49-67"},"PeriodicalIF":2.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44134774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信