Acta Geologica Sinica ‐ English Edition最新文献

Lithostratigraphy and Microfacies Analysis of the Govanda Formation (Early–Middle Miocene) in the Sherwan Mazin Area, Kurdistan Region, NE Iraq 伊拉克东北部库尔德斯坦地区Sherwan Mazin地区古旺达组（早-中中新世）岩石地层及微相分析

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15314

Arkan O. SHARAZWRI, Bzhar A. DELIZY

{"title":"Lithostratigraphy and Microfacies Analysis of the Govanda Formation (Early–Middle Miocene) in the Sherwan Mazin Area, Kurdistan Region, NE Iraq","authors":"Arkan O. SHARAZWRI, Bzhar A. DELIZY","doi":"10.1111/1755-6724.15314","DOIUrl":"https://doi.org/10.1111/1755-6724.15314","url":null,"abstract":"The Govanda Formation was deposited during the Miocene in the intermontane areas between the Zagros suture and imbricate zones. The Govanda Formation was studied in the Sherwan Mazin area within Mergasor district, Erbil Governorate to identify the lithostratigraphy and microfacies analysis in order to determine the depositional environment of the formation. The formation in the studied section is 116 m thick and mainly consists of reddish-brown, hard, thick-bedded, chert-bearing conglomerate, pinkish shale and yellowish-grey, thick-bedded, detrital, fossiliferous limestone. The formation is unconformably underlain by the Upper Cretaceous Tanjero Formation and conformably overlain by the Merga Red Beds series. Four different lithostratigraphic units were identified, based on field observation and petrographic analysis, including a basal conglomerate unit (A), a shale unit (B), a well-bedded limestone unit (C) and a thick and massively-bedded limestone unit (D). The presence of a thick conglomerate bed at the base of the formation indicates a large unconformity that lasted nearly 40 million years. Based on detailed microfacies analysis of carbonate rocks, five main microfacies and 15 submicrofacies are recognized. The main microfacies types include mudstone, wackestone, packstone, grainstone and boundstone microfacies. Based on the microfacies types the depositional environment are defined as open lagoon, reef, fore-reef and back-reef environments of normal to saline, nutrient rich water.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"667-678"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Early Paleozoic Bimodal Magmatism Documents the Transition from Collisional to Extensional Tectonics within the Central Himalaya 早古生代双峰岩浆作用记录了喜马拉雅中部由碰撞构造向伸展构造的转变

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15300

Zhiqiang YIN, Longqiang LIU, Xiaochun LÜ, Nan LI, Lidong ZHU, Qiang LIU, Erjia HA

{"title":"Early Paleozoic Bimodal Magmatism Documents the Transition from Collisional to Extensional Tectonics within the Central Himalaya","authors":"Zhiqiang YIN, Longqiang LIU, Xiaochun LÜ, Nan LI, Lidong ZHU, Qiang LIU, Erjia HA","doi":"10.1111/1755-6724.15300","DOIUrl":"https://doi.org/10.1111/1755-6724.15300","url":null,"abstract":"The tectonic setting of the Himalaya during the Early Paleozoic has been a subject of enduring debate within the scientific community. Newly discovered bimodal intrusive rocks from comprehensive field geological investigation in the central mountain range were subjected to petrology, zircon U-Pb geochronology, zircon Hf isotopes and whole-rock geochemistry analyses. The Palie bimodal intrusive rocks, comprising amphibolite and granitic gneiss, were formed at ∼489 Ma. The amphibolite exhibits geochemical characteristics consistent with N-MORB, while the granitic gneiss is classified as high potassium calc-alkaline peraluminous S-type granite. Both igneous rocks exhibit negative zircon εHf(t) values and display ancient TDMC ages. In conjunction with regional geological survey findings, it can be inferred that the formation of the Palie bimodal intrusive rocks occurred within a post-collision extensional tectonic setting. The amphibolite genesis involved partial melting of an enriched lithospheric mantle with some crustal assimilation, whereas the origin of the granitic gneiss can be attributed to partial melting of pre-existing felsic crust. Our data indicate that during the Early Paleozoic, the Himalaya underwent a transition from a pan-African collisional setting to post-collisional extensional tectonics.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"679-692"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Sequence Stratigraphic Division of the Devonian Liujiang Formation Dominated by Silicalites in the Northeastern Part of the Dianqiangui Basin, South China 滇黔桂盆地东北部以硅质岩为主的泥盆系柳江组层序地层划分

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15309

Yingjie ZHANG, Wenpan CEN, Yinglun QIN, Chenglong MA, Jiyu CHEN, Wenfang HUANG, Long WANG

{"title":"Sequence Stratigraphic Division of the Devonian Liujiang Formation Dominated by Silicalites in the Northeastern Part of the Dianqiangui Basin, South China","authors":"Yingjie ZHANG, Wenpan CEN, Yinglun QIN, Chenglong MA, Jiyu CHEN, Wenfang HUANG, Long WANG","doi":"10.1111/1755-6724.15309","DOIUrl":"https://doi.org/10.1111/1755-6724.15309","url":null,"abstract":"Silicalites are extensively developed in the Liujiang Formation (Fm.) of the Frasnian in the Dianqiangui Basin and are often associated with carbonaceous shales. This stratigraphic combination represents a special sequence stratigraphy formed in special deep-water environments, which not only gives the shales unusual spatio-temporal distribution features, but also induces the shales in the Liujiang Fm. to frequently be rich in organic matter (OM). This study summarises the special deep-water sedimentary succession of the Liujiang Fm., which is mainly distributed around synsedimentary faults, as well as establishing the sequence stratigraphic frameworks of the Liujiang Fm. in the west–east and southwest–northeast directions. Under the sequence stratigraphic frameworks, the spatio-temporal distribution features of the organic-rich shales of the Liujiang Fm. and the regional variations of the Liujiang Fm. were investigated. In addition, the rock components and OM occurrence states of the organic-rich shales were also observed and described in detail under the microscope. The results show that the organic-rich shales were formed temporally primarily during the third-order sea-level falling stage, developed spatially mainly on the east and west sides of the study area, as well as that the OM accumulation is closely related to tentaculitoids and seems to be influenced by a ‘biological pump’.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"646-666"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Seasonal Evolution of Eocene Saline Lakes in Eastern China: A Case Study of ‘Bamboo-like’ Rock Salt in the Shizhai Depression, Northern Jiangsu Province 中国东部始新世盐湖的季节演化——以苏北石寨凹陷“竹状”岩盐为例

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15298

Yang XU, Chenglin LIU, Sibo YANG, Yangtong CAO, Longtao WEN, Ruiqin LI

{"title":"Seasonal Evolution of Eocene Saline Lakes in Eastern China: A Case Study of ‘Bamboo-like’ Rock Salt in the Shizhai Depression, Northern Jiangsu Province","authors":"Yang XU, Chenglin LIU, Sibo YANG, Yangtong CAO, Longtao WEN, Ruiqin LI","doi":"10.1111/1755-6724.15298","DOIUrl":"https://doi.org/10.1111/1755-6724.15298","url":null,"abstract":"The phenomenon of ‘bamboo-like’ thin interlayers developed in rock salt is one of the most prominent features of Paleogene salt-bearing strata in eastern China, where centimeter-thick rock salts appear separately, forming rhythmic units. At present, detailed analyses of these rhythms of rock salt are still limited, which directly affects the achievement of comprehensive and in-depth understanding of the developmental laws pertaining to this kind of saline lake. Therefore, we selected the typical rhythmic ‘bamboo-like’ rock salts of the Shizhai Depression in Jiangsu Province as the research subject. Through careful observation of rock salts in hand samples and detailed petrographic and mineralogical analyses, we analyzed the hydrogen and oxygen isotopic compositions, homogenization temperatures and chemical compositions of individual fluid inclusions in halite crystals. Early-stage rhythmic deposition was a product of continental saline lake evolution in winter or spring, late-stage rhythmic deposition being the product of evolution in the summer. The seasonal evolution of the halite sequences was determined and two brine enrichment events were identified. In addition, the quiet saline lake environment with concentrated brine represented by rock salt was more likely to precipitate potassium. This study provides a new reference for the evolution of both Paleogene climate and saline lakes in eastern China.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"879-895"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Miocene Pb-Zn Mineralization in the Eastern Gangdese Metallogenic Belt: Evidence from in situ Rb-Sr Dating of Mica and Trace Element Geochemistry of Sphalerite 冈底斯成矿带东部中新世铅锌成矿作用：云母原位Rb-Sr定年及闪锌矿微量元素地球化学证据

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15310

Xiaoyan ZHAO, Zhusen YANG, Chang LIU, Yanrui DONG, Haiyan SHI

{"title":"Miocene Pb-Zn Mineralization in the Eastern Gangdese Metallogenic Belt: Evidence from in situ Rb-Sr Dating of Mica and Trace Element Geochemistry of Sphalerite","authors":"Xiaoyan ZHAO, Zhusen YANG, Chang LIU, Yanrui DONG, Haiyan SHI","doi":"10.1111/1755-6724.15310","DOIUrl":"https://doi.org/10.1111/1755-6724.15310","url":null,"abstract":"Four Pb-Zn deposits, namely Bangpu (BP), Digei (DG), Nabuding (NB) and Cuoga (CG), are located within a 20 km distance of each other in the Gangdese porphyry copper belt (GPCB). The age and nature of the Pb-Zn mineralization, especially its relationship to magmatism, remain uncertain. In order to address this issue, mica from the four deposits was selected for in situ Rb-Sr dating, with sphalerite additionally being selected for in situ trace element analysis. Detailed geological research has revealed that the BP and NB deposits are primarily skarn-type Pb-Zn mineralization, while DG and CG are associated with magmatic hydrothermal breccia and are characterized by banded-type mineralization. The Rb-Sr isochron ages of syn-mineralization muscovite at the BP and CG deposits are 11 ± 6 Ma and 19.7 ± 0.7 Ma respectively. Fe, Cd, In, Mn and Sn occur as lattice substitutions in sphalerite from the four deposits. Cu exists as microinclusions in BP, but occurs isomorphically in the DG, NB and CG deposits. The formation temperatures of the four deposits, as calculated from sphalerite geothermometry, range from approximately 200°C to 300°C, indicating that they belong to medium temperature deposits. BP and NB are classified as skarn Pb-Zn deposits, while DG and CG are categorized as hydrothermal filled Pb-Zn deposits. These results suggest that, in addition to porphyry Cu mineralization, the GPCB also contains significant Miocene Pb-Zn mineralization.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"806-821"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Acta Geologica Sinica (English Edition) Calls for Submission of Review Papers 地质学报（英文版）征稿

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15316

引用次数: 0

Petrogenesis of the Dupangling Granitic Complex, South China: Implications for A-type and Strongly Peraluminous Granite Origin 华南杜邦岭花岗岩杂岩的岩石成因：对a型和强过铝花岗岩成因的启示

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15312

Yaohui JIANG, Yajie ZHAO, Yunchao LIU, Boning HAN

{"title":"Petrogenesis of the Dupangling Granitic Complex, South China: Implications for A-type and Strongly Peraluminous Granite Origin","authors":"Yaohui JIANG, Yajie ZHAO, Yunchao LIU, Boning HAN","doi":"10.1111/1755-6724.15312","DOIUrl":"https://doi.org/10.1111/1755-6724.15312","url":null,"abstract":"Granite origin is crucial to understanding the evolution of continental crust, yet many concerns about granite genesis remain yielding ongoing debates. A new integrated study of petrology, geochronology, mineral chemistry and whole-rock geochemistry of the Dupangling granitic complex in South China, indicate that the granites in the western complex were emplaced during the Caledonian (418 Ma); they have SiO2 contents of 68.1–70.4 wt%, and are calc-alkaline and strongly peraluminous with high maficity [(TFe2O3 + MgO) > 4.0 wt%] and exhibit 87Sr/86Sr(t) of 0.7234–0.7311 and εNd(t) of –9.0 to –6.7. The granites in the eastern complex, emplaced during the Indosinian (212 Ma), have high SiO2 contents (73.3–79.8 wt%) and exhibit affinities with A-type granites, such as enrichment in alkalis and rare earth elements (REEs), and depletion in Sr and Ba along with high TFeO/(TFeO + MgO), Ga/Al and Zr + Y + Ce + Nb; these granites exhibit 87Sr/86Sr(t) of 0.7221 and εNd(t) of –9.2 to –7.5. Geochemical characteristics suggest that the older Caledonian granites were derived through dehydration melting of Paleoproterozoic metasedimentary rocks plus additional (∼20%–32%) input from mafic magma, whereas the Indosinian granites were generated through shallow dehydration melting of the Caledonian granitoids.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"725-742"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Origin of the Cretaceous Biluocuo Low-Mg Trachy-Andesites in the Southern Qiangtang Block: Implications for Crust–Mantle Interactions and the Precambrian Basement 南羌塘地块白垩系碧螺错低镁特拉奇安山岩的成因：壳幔相互作用和前寒武纪基底的意义

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15315

Changjun JI, Chong CHEN, Yuanbing ZOU, Yun CHEN, Lianfeng Zhou, Jiang ZHU

{"title":"Origin of the Cretaceous Biluocuo Low-Mg Trachy-Andesites in the Southern Qiangtang Block: Implications for Crust–Mantle Interactions and the Precambrian Basement","authors":"Changjun JI, Chong CHEN, Yuanbing ZOU, Yun CHEN, Lianfeng Zhou, Jiang ZHU","doi":"10.1111/1755-6724.15315","DOIUrl":"https://doi.org/10.1111/1755-6724.15315","url":null,"abstract":"The Cretaceous andesites were discovered in the Biluocuo area, and provided key records to understand the late Mesozoic geodynamic evolution and crustal basement for the southern Qiangtang block in the central Tibet. In this study, we present a detailed study of zircon U-Pb dating, major and trace elemental composition, and Sr-Nd-Hf isotopes for the Biluocuo trachy-andesites. The trachy-andesites yielded zircon U-Pb ages at ca. 97 Ma, and exhibited SiO2 contents ranging from 55.92 to 69.04 wt%, low TiO2 contents (0.37 to 0.75 wt%) and low Mg# values (18.6 to 53.7), suggesting that they belong to high-K calc-alkaline series. They showed adakitic signatures, such as high Sr/Y ratios (almost 24 to 55) and low Y (<20 ppm), implying they were generated at great depths (>15 kbar). The samples have initial Sr isotopic ratios of 0.70963 to 0.70964, εNd(t) values of –4.7 to –4.6, and zircon εHf(t) values of –1.2 to +1.3 with two-stage Hf model ages of 0.95 to 1.09 Ga. Elemental and Sr-Nd-Hf isotopic signatures suggest that the trachy-andesites were derived from the partial melting of the thickened lower crust with involvement of metasomatized mantle components. Combined with coeval high-Mg andesites, we proposed that underplating of mantle induced melting of the lower crust at ca. 97 Ma in the southern Qiangtang block, following by lithospheric delamination. Inherited/xenocrystic zircons from the trachy-andesites revealed magmatic activities at 2562 Ma, 1850–1804 Ma, 1768–1665 Ma, 1043–935 Ma, 851–736 Ma and 642–540 Ma. There is a Precambrian crustal basement in the southern Qiangtang block, which may have experienced the assembly and break-up of the Columbia, Rodinia, and Gondwana supercontinents.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"761-773"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Geochemistry and Lithium Enrichment Modes of the No. 8 Coal, Late Carboniferous, Eastern Ordos Basin 鄂尔多斯盆地东部晚石炭世8号煤地球化学特征及锂富集模式

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15304

Jiaming ZHANG, Yinghai GUO, Ruoyu WANG, Difei ZHAO, Zhibo ZHANG, Zhuoxi LIU, Gaomin QUAN, Jiahui LIU, Dandan LIU

{"title":"Geochemistry and Lithium Enrichment Modes of the No. 8 Coal, Late Carboniferous, Eastern Ordos Basin","authors":"Jiaming ZHANG, Yinghai GUO, Ruoyu WANG, Difei ZHAO, Zhibo ZHANG, Zhuoxi LIU, Gaomin QUAN, Jiahui LIU, Dandan LIU","doi":"10.1111/1755-6724.15304","DOIUrl":"https://doi.org/10.1111/1755-6724.15304","url":null,"abstract":"Recent studies have highlighted the presence of lithium enrichment in coals within the Ordos Basin, which has garnered significant attention due to the potential economic value. However, most research has concentrated primarily on the coal seams of the Taiyuan and Shanxi formations, with limited reports on the Benxi Formation. To address this gap, our study focused on elucidating the geochemical characteristics and origins of the lithium enrichment in the No. 8 coal of the Benxi Formation through the use of optical microscopy and inductively coupled plasma mass spectrometry (ICP-MS). The results showed that the No. 8 coal was a bituminous coal, characterized by medium ash yield, low volatile matter, high total sulfur content and medium vitrinite proportion. The No. 8 coal was enriched in Li (average 91.7 ppm, CC = 6.55) and Zr (average 191 ppm, CC = 5.30), the unusual enrichment of Li being primarily located in the middle of the coal. The minerals in the coal were predominantly clay minerals, along with minor amounts of pyrite, quartz and calcite. The occurrence mode of Li in the No. 8 coal was associated with aluminosilicate minerals, presumably kaolinite. Based on geochemical characteristics, the sedimentary source of the No. 8 coal was intermediate-felsic volcanic rock from the Yinshan oldland. The enrichment of Li can be attributed to the supply of terrestrial debris from the Yinshan oldland and the depositional environment. Our analysis identifies three distinct stages of lithium enrichment, emphasizing the critical role played by the terrestrial debris, as well as the acidic to partially reducing conditions, in facilitating this process. In conclusion, our study sheds light on the mechanisms underlying lithium enrichment in the No. 8 coal of the Benxi Formation, highlighting the significance of geological factors in shaping the distribution and concentration of critical metals in coal.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"822-839"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Petrogenesis and Tectonic Implications of the Kwangsian Orogen: Constraints from Geochemistry and Sr-Nd-Hf Isotopic Compositions of the Early Paleozoic Peraluminous and Aluminous Granitoids in Northern Guangdong, SE China 广仙造山带的岩石成因及其构造意义：粤北早古生代过铝质和铝质花岗岩类地球化学和Sr-Nd-Hf同位素组成的制约

IF 3.5 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-06-30 DOI: 10.1111/1755-6724.15296

Xiaohui JIA, Xiaodi WANG, Xiaofei QIU, Wenqiang YANG

{"title":"Petrogenesis and Tectonic Implications of the Kwangsian Orogen: Constraints from Geochemistry and Sr-Nd-Hf Isotopic Compositions of the Early Paleozoic Peraluminous and Aluminous Granitoids in Northern Guangdong, SE China","authors":"Xiaohui JIA, Xiaodi WANG, Xiaofei QIU, Wenqiang YANG","doi":"10.1111/1755-6724.15296","DOIUrl":"https://doi.org/10.1111/1755-6724.15296","url":null,"abstract":"This study presents whole-rock major, trace elements and Sr-Nd-Hf isotopic compositions, as well as zircon U-Pb geochronological data, for the peraluminous and aluminous granitoids in northern Guangdong Province, South China, in order to investigate their petrogenesis and tectonic implications. The Qingzhou granodiorites (458.5–455.4 Ma) are peraluminous (A/CNK = 1.05–1.96). They have relatively high initial 87Sr/86Sr ratios (ISr = 0.7087–0.7148), low εNd(t) values (–11.2 to –10.1) and a variety of zircon εHf(t) values in the range –13.4 to +4.81. By contrast, the Damaoshan granodiorites (458.1 Ma) are metaluminous (A/CNK = 0.79–0.94) in composition, with ISr values of 0.7083 to 0.7110, εNd(t) values of –7.92 to –5.28 and zircon εHf(t) values of –8.69 to –2.06. The Gaoshou quartz diorites (449 Ma) are metaluminous-peraluminous. Their ISr values vary from 0.7104 to 0.7111 with εNd(t) values from –9.64 to –8.63. Geochemical data and Sr-Nd-Hf isotope compositions indicate that the Qingzhou, Damaoshan and Gaoshou intrusions are primarily derived from the partial melting of metagreywackes, tonalitic rocks and amphibolite, respectively. The crustal materials in northern Guangdong, from top to bottom, consist of Paleozoic sequences, metasediments with a Vp of < 6.0 km/s, metaigneous rocks with a Vp of 6.3–6.7 km/s and amphibolite with a Vp of ∼7.03 km/s.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"99 3","pages":"707-724"},"PeriodicalIF":3.5,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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