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Corrigendum to “Soil CO2 fluxes measured in the Acoculco Geothermal System, Mexico: Baseline emissions from a long-term prospection programme” [Geochem. In Press, Corrected Proof] 墨西哥 Acoculco 地热系统测量的土壤二氧化碳通量:长期勘探计划的基准排放量"[Geochem. In Press, Corrected Proof] 更正
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126151
{"title":"Corrigendum to “Soil CO2 fluxes measured in the Acoculco Geothermal System, Mexico: Baseline emissions from a long-term prospection programme” [Geochem. In Press, Corrected Proof]","authors":"","doi":"10.1016/j.chemer.2024.126151","DOIUrl":"10.1016/j.chemer.2024.126151","url":null,"abstract":"","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 3","pages":"Article 126151"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S000928192400076X/pdfft?md5=830cddcf6ecdc4e74d5cc8f40dcc1d11&pid=1-s2.0-S000928192400076X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141408104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hydrothermal alteration of accessory minerals (allanite and titanite) in the late Archean Closepet granitoid (Dharwar Craton, India): A TEM study 晚阿全新统 Closepet 花岗岩(印度 Dharwar 克拉顿)中附属矿物(阳起石和榍石)的热液蚀变:TEM 研究
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126130
{"title":"Hydrothermal alteration of accessory minerals (allanite and titanite) in the late Archean Closepet granitoid (Dharwar Craton, India): A TEM study","authors":"","doi":"10.1016/j.chemer.2024.126130","DOIUrl":"10.1016/j.chemer.2024.126130","url":null,"abstract":"<div><p>Allanite, a member of the epidote supergroup, is a widespread rare earth element (REE)-rich accessory mineral in the late Archean Closepet batholith (Dharwar craton, India). It is commonly associated with titanite. Previously recognized shear zones served as preferential paths for magma and later fluids. As a response to hydrothermal activity, allanite exhibits complex alteration textures, geochemical features, and breakdown products that vary across the batholith. In the central zone, allanite displays the largest variations. It has decomposed into secondary allanite, bastnäsite, chlorite, thorite, calcite, pyrite, and galena. In the southern zone, magmatic allanite core is preserved. The alteration products in the marginal regions are limited to secondary allanite, bastnäsite, chlorite, thorite, and synchysite. The breakdown products and textural features of allanite in the northern intrusions differ strongly from those in the other zones of the Closepet batholith and are limited to secondary allanite and chamosite. However, nanoscale element remobilization at the interface between allanite and titanite is evident. The observed texture in allanite indicates a complete dissolution–reprecipitation process. The chemical variations and differences in alteration products after allanite indicate that the fluid composition changed along the Closepet granitoid. The fluids that altered the allanite were most likely F-, Cl-, and CO<sub>2</sub>-rich and alkaline but eventually became acidic. When the chlorine-bearing fluids reached the northern zone, the concentrations or active contributions of CO<sub>2</sub>, F and H<sub>2</sub>S were very low. The alteration products (bastnäsite, chlorite, and thorite) indicate a rather low-temperature fluid.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 3","pages":"Article 126130"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0009281924000540/pdfft?md5=75b617cab2768aaa9de40a2f77de7a40&pid=1-s2.0-S0009281924000540-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141026738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microstructural control on the trace element distribution and Au concentration in pyrite nodules 黄铁矿结核中微量元素分布和金浓度的微观结构控制
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126174
Riccardo Graziani , Duane C. Petts , Jean-Luc Pilote , Simon E. Jackson , Daniele Regis , Christopher J.M. Lawley , Matthew Polivchuk , Yannick Bussweiler , Martin Rittner
{"title":"Microstructural control on the trace element distribution and Au concentration in pyrite nodules","authors":"Riccardo Graziani ,&nbsp;Duane C. Petts ,&nbsp;Jean-Luc Pilote ,&nbsp;Simon E. Jackson ,&nbsp;Daniele Regis ,&nbsp;Christopher J.M. Lawley ,&nbsp;Matthew Polivchuk ,&nbsp;Yannick Bussweiler ,&nbsp;Martin Rittner","doi":"10.1016/j.chemer.2024.126174","DOIUrl":"10.1016/j.chemer.2024.126174","url":null,"abstract":"<div><p>The crystal growth history of an Au-rich sedimentary pyrite nodule from the Timmins-Porcupine Au camp, Ontario, Canada, has been investigated using Electron Backscattered Diffraction and Laser Ablation Inductively Coupled Plasma Mass Spectrometry techniques to study the crystallographic processes controlling metal deportment in the pyrite structure. Results show four distinct growth stages characterized by different pyrite microstructures, crystal forms and trace element compositions. A direct link is observed between the growth of octahedral facets in pyrite and the development of primary (non-tectonic) subgrain boundaries. Furthermore, zones with a high abundance of subgrain boundaries have the highest Au, As, Ag and Cu (and other metals) contents – suggesting metal distribution is linked to the development of microstructures. Finer-grained aggregates are characterized by higher grain boundary density than in coarse areas, making higher trace element concentrations inversely proportional to grain size. Our results indicate that the high Au concentrations (~100 ppm) in pyrite represent a primary feature related to nodule growth, instead of secondary enrichment processes, and highlight the possibility that sediment-hosted pyrite nodules could represent a metal-rich geochemical reservoir for the formation of younger orogenic Au deposits.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 3","pages":"Article 126174"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0009281924000990/pdfft?md5=660382ad12adb4b6441f7a0e40592512&pid=1-s2.0-S0009281924000990-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Petrogenesis of the Neoarchean (2.7 Ga) Poularies intrusion: Geochemical evolution of a shallow syn-volcanic granitoid complex from the Abitibi granite-greenstone belt, Québec 新雅典(2.7 Ga)普拉利斯侵入体的岩石成因:魁北克阿比提比花岗岩-绿岩带浅层同步火山花岗岩复合体的地球化学演化
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126164
{"title":"Petrogenesis of the Neoarchean (2.7 Ga) Poularies intrusion: Geochemical evolution of a shallow syn-volcanic granitoid complex from the Abitibi granite-greenstone belt, Québec","authors":"","doi":"10.1016/j.chemer.2024.126164","DOIUrl":"10.1016/j.chemer.2024.126164","url":null,"abstract":"<div><p><span><span><span>The Poularies igneous complex is a Neoarchean (2728 Ma) intrusion composed of diorite<span>, quartz diorite, hornblende tonalite, and </span></span>biotite tonalite. It is was emplaced into the shallow crust of the Abitibi granite-greenstone belt during volcanic cycle 1 (2730–2725 Ma) and is contemporaneous with the eruption of mafic (Stoughton-Roquemaure Group) and silicic volcanic rocks (Hunter Mine Group). The petrogenetic relationship between the silicic rocks of the Poularies igneous complex is not constrained. In this study we test the petrological association between the different rock types of the Poularies complex using </span>fractional crystallization modeling. Hydrous (H</span><sub>2</sub><span><span><span>O = 3 wt%) fractional crystallization modeling using a ‘primitive’ intermediate starting composition demonstrates that all rock types of the Poularies complex can be generated from a common parental magma in the </span>upper crust (1 kbar) under mildly oxidizing conditions (ΔFMQ = 0). Moreover, it is demonstrated that the parental magma of the Poularies complex was likely derived by partial melting of </span>mafic rocks<span> from the Abitibi granite-greenstone belt. We conclude that the Poularies complex is representative of a magma chamber that generated the silicic lavas of the spatially associated Hunter Mine Group in a rifting or tensional plate stress environment. Our model may be applicable to other shallow </span></span><em>syn</em>-volcanic plutons of the Abitibi granite-greenstone belt.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 3","pages":"Article 126164"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569355","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
Source and age of the Ngaye banded iron formations, Adamawa Yadé Domain, Central Cameroon: Constraints from whole-rock geochemistry and U-Pb zircon geochronology 喀麦隆中部阿达马瓦亚德地区Ngaye带状铁地层的来源和年龄:全岩地球化学和 U-Pb 锆石地质年代学的制约因素
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126173
Arnold Steven Motto Mbita , Marvine Nzepang Tankwa , Landry Soh Tamehe , Donald Hermann Fossi , Guy Bertin Takam Tchoupe , Sylvestre Ganno , Jean Paul Nzenti
{"title":"Source and age of the Ngaye banded iron formations, Adamawa Yadé Domain, Central Cameroon: Constraints from whole-rock geochemistry and U-Pb zircon geochronology","authors":"Arnold Steven Motto Mbita ,&nbsp;Marvine Nzepang Tankwa ,&nbsp;Landry Soh Tamehe ,&nbsp;Donald Hermann Fossi ,&nbsp;Guy Bertin Takam Tchoupe ,&nbsp;Sylvestre Ganno ,&nbsp;Jean Paul Nzenti","doi":"10.1016/j.chemer.2024.126173","DOIUrl":"10.1016/j.chemer.2024.126173","url":null,"abstract":"<div><p>The Ngaye inlier of the Adamawa Yadé Domain is located in the Central African Fold Belt, adjacent to the Nyong Complex at the northern margin of the Congo craton, in central Cameroon. This area consists of metamorphosed granite-greenstone associations comprising amphibole- and pyroxene-rich banded iron formations (BIFs), amphibolites, and migmatitic gneisses. This study reports detailed petrographic, whole-rock geochemical, and LA-ICP-MS U-Pb zircon data for the Ngaye BIFs and associated amphibolites to better constrain their source, tectonic setting, and age. Amphibole-rich BIFs exhibit high REE-Y content and uncommon LREE-enriched patterns. In contrast, pyroxene-rich BIFs display combined low REE-Y content, seawater-like patterns, and positive Eu anomalies, suggesting a mixture of seawater and hydrothermal fluids during their deposition. The geochemical data of associated amphibolites suggest a back-arc setting for the Ngaye metavolcanosedimentary sequence, similar to that of the Nyong Complex. LA-ICP-MS U-Pb zircon dating of amphibole-rich BIFs indicate a maximum depositional age of ca. 2186 Ma and subsequent metamorphism at ca. 2038 Ma, overlapping with that of metavolcanosedimentary sequences from the Nyong Complex. Neoproterozoic age of ca. 598 Ma obtained for these BIFs is interpreted as the Pan-African metamorphic/hydrothermal imprint. This finding suggests that the post-depositional fluid overprint was probably related to the regional Pan-African tectono-thermal event.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 3","pages":"Article 126173"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187185","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
Experimental leaching of lithium ores in simulated environmental conditions 模拟环境条件下的锂矿石沥滤实验
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126132
{"title":"Experimental leaching of lithium ores in simulated environmental conditions","authors":"","doi":"10.1016/j.chemer.2024.126132","DOIUrl":"10.1016/j.chemer.2024.126132","url":null,"abstract":"<div><p><span><span>Leaching experiments were performed on zinnwaldite-rich greisen<span>, pure zinnwaldite separated from the greisen, spodumene<span> pegmatite, and pure lepidolite in dilute sulfuric, acetic, and </span></span></span>oxalic acids (all 0.01 M) as well as deionized water to simulate common environmental conditions. The experiments were carried out at room temperature over a period of 267 days (9 months). Considerable amounts of Li, Al, and Fe (up to 0.76 mM, 6.60 mM, and 0.87 mM, respectively) were observed in the leachates as a result of Li-mica dissolution. The dissolution time-series trends of [SiO</span><sub>2</sub>], [Al] and [Li] for the whole-rock zinnwaldite-greisen and the pure zinnwaldite separate are nearly identical, suggesting preferential dissolution of zinnwaldite in the greisen host rock. Lepidolite released the highest amounts of SiO<sub>2</sub><span> and Al into the solution, but it also has the smallest grain size and largest specific surface area of the studied samples. Lepidolite samples further show decreasing [Li] in the sulfuric and acetic acid leachates. Spodumene pegmatite released the smallest amounts of analytes in each experiment, except for Fe. Using SEM-EDX, backscattered electron images, and powder XRD, we observed and identified precipitates of secondary quartz resulting from Li-mica dissolution, as predicted by our geochemical modeling. Even though elpasolite was not observed using the SEM, the mineral was detected in some samples via XRD, suggesting that large amounts of F were present in these leachates. We conclude that enhanced weathering of Li-mica deposits due to their development and mining may lead to a considerable influx of Li, Al, and F into surface waters in adjacent areas.</span></p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 3","pages":"Article 126132"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141132810","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 fluid inclusion study of the Jbel Tirremi fluorite-baryte deposit, Morocco: New insights into the genetic model in relation to Mesozoic tectonics 摩洛哥 Jbel Tirremi 萤石重晶石矿床的地球化学和流体包裹体研究:与中生代构造有关的成因模型新见解
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126162
Larbi Rddad , Mohammed Cherai , Benjamin F. Walter , Fouad Talbi , Dennis Kraemer , Kjell Billström
{"title":"Geochemistry and fluid inclusion study of the Jbel Tirremi fluorite-baryte deposit, Morocco: New insights into the genetic model in relation to Mesozoic tectonics","authors":"Larbi Rddad ,&nbsp;Mohammed Cherai ,&nbsp;Benjamin F. Walter ,&nbsp;Fouad Talbi ,&nbsp;Dennis Kraemer ,&nbsp;Kjell Billström","doi":"10.1016/j.chemer.2024.126162","DOIUrl":"10.1016/j.chemer.2024.126162","url":null,"abstract":"<div><p>The highly fractured Jurassic carbonates at Jbel Tirremi in northeastern Morocco host fluorite-baryte deposit. The mineralization occurs both as stratabound in marl-limestone contact and as fault-hosted veins (N-S- and NNW-SSE). The mineral paragenesis consists of two fluorite and baryte generations and calcite with subordinate amounts of quartz, dolomite, traces of sulfides (chalcopyrite, pyrite, galena), and oxidized minerals. Fluid inclusion data reveal that hot moderately saline fluids derived from the Paleozoic basement mixed with Triassic brines and cooler, meteoric waters. The REY inventory, C-O-S-Pb-Sr-Nd isotope, and crush-leach data point to the Paleozoic basement as the primary source of metals with a contribution from the Triassic red beds. The refined ore genetic model developed in this study from our new geological and geochemical data includes the downward movement of Triassic-Jurassic evaporated seawaters along normal faults, followed by the leaching of metals from Paleozoic and Triassic rocks, and the subsequent upward flow of these metalliferous fluids. During the Late Cretaceous-Paleocene basin inversion, the deep-seated ore-forming fluids migrated upward, which eventually mixed with Triassic brines and cooler meteoric waters. This fluid mixing caused the precipitation of multiple generations of fluorite and baryte.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 3","pages":"Article 126162"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141711885","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
Geochronology and geochemistry of a Neoproterozoic syn-tectonic granitic pluton in the Gari-Gombo area, East Cameroun: Implications for petrogenesis and tectonic evolution 喀麦隆东部加里-贡博地区新新生代同步构造花岗岩岩体的地质年代和地球化学:岩石成因和构造演化的意义
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126161
{"title":"Geochronology and geochemistry of a Neoproterozoic syn-tectonic granitic pluton in the Gari-Gombo area, East Cameroun: Implications for petrogenesis and tectonic evolution","authors":"","doi":"10.1016/j.chemer.2024.126161","DOIUrl":"10.1016/j.chemer.2024.126161","url":null,"abstract":"<div><p><span>Granites are widespread in many Precambrian<span><span> orogenic belts worldwide; therefore, they can provide insights into orogenic processes and associated </span>magmatism<span>. Zircon U</span></span></span><img><span><span><span>Pb age, monazite Th-U-total Pb age and whole-rock geochemical data for a granite pluton from the Gari-Gombo area in the Adamawa-Yade domain of the Central African Fold Belt (CAFB) in East Cameroon are presented. The granite is composed dominantly of perthitic K-feldspars, quartz, plagioclase and minor </span>biotite with accessory monazite, </span>apatite and zircon. LA-ICP-MS zircon U</span><img><span>Pb dating yielded an age at ca 631–620 Ma, which is interpreted as age of emplacement that coincides with the onset of D2 Pan-African deformation. Monazite grains in Gari-Gombo granite follow strictly the huttonite substitution trend in Th + U vs Si coordinates. Monazites give consistent Neoproterozoic ages of 630 ± 4 Ma and 602 ± 4 Ma, indicating that growth history and crystallization age of monazites also correlate well with the Pan-African plutonism<span> and granulite facies metamorphism (ca 614–600 Ma) in the Gari-Gombo area. The Gari-Gombo pluton samples show high-K calc-alkaline magnesian, slightly peraluminous signature, high SiO</span></span><sub>2</sub> (70.16–78.80 wt%), K<sub>2</sub>O (4.39–5.38 wt%), and Rb (165–248 ppm), and low P<sub>2</sub>O<sub>5</sub><span> ≤ 0.01 wt% and Sr (146–222 ppm) contents. They have highly-fractionated REE pattern ((La/Yb)</span><sub><em>N</em></sub> = 6.17–148.18), moderately Eu negative anomalies (Eu/Eu* = 0.53–0.93) and the obviously Nb and Ti negative anomalies. These geochemical features suggest that the Gari-Gombo pluton is a highly fractionated I-type granite generated by partial melting of older meta-igneous materials at middle to lower crustal levels. The 2.9 and 0.95 Ga inherited zircon grains identified within the studied granites further confirm the existence of ancient crust in this region.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 3","pages":"Article 126161"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141505942","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
Petrology, phase equilibria modelling, and fluid inclusion study of mafic granulites from Bhavani Suture Zone, Southern India 印度南部巴瓦尼断裂带黑云母花岗岩的岩石学、相平衡模型和流体包裹体研究
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126175
Sam Uthup , Toshiaki Tsunogae , Kazuki Takahashi , V.J. Rajesh , J. Gregory Shellnutt
{"title":"Petrology, phase equilibria modelling, and fluid inclusion study of mafic granulites from Bhavani Suture Zone, Southern India","authors":"Sam Uthup ,&nbsp;Toshiaki Tsunogae ,&nbsp;Kazuki Takahashi ,&nbsp;V.J. Rajesh ,&nbsp;J. Gregory Shellnutt","doi":"10.1016/j.chemer.2024.126175","DOIUrl":"10.1016/j.chemer.2024.126175","url":null,"abstract":"<div><p>We report new petrology, mineral chemistry, <em>P</em>–<em>T</em> conditions, and fluid inclusion data on mafic granulites from the Mettupalayam region along the Bhavani Suture Zone, Southern Granulite Terrane, India. Phase equilibria modelling of mafic granulites yielded peak <em>P</em>–<em>T</em> conditions of 780–860 °C and 7.6–10.1 kbar followed by a near isothermal decompression along a clockwise <em>P</em>–<em>T</em> path. The trapped fluid inclusions in the peak metamorphic minerals display a melting temperature range from −57.4 °C to −56.6 °C, close to the triple-point temperature of pure CO<sub>2</sub>. The primary inclusions homogenized at −18.9 °C to +0.2 °C, corresponding to density values of 0.93–1.03 g/cm<sup>3</sup>. Homogenization of the secondary inclusions occurred within the range from −6.3 to +18.1 °C, corresponding to low CO<sub>2</sub> densities of 0.79–0.96 g/cm<sup>3</sup>. From the textural characteristics of the high-density primary carbonic fluid inclusions, we interpret these inclusions as the CO<sub>2</sub>-rich <em>syn</em>-metamorphic fluid present during the high-grade metamorphism. The secondary fluids characterised by lower densities have undergone re-equilibration during the exhumation stage (decompression) from the peak granulite-facies metamorphism along a clockwise <em>P</em>–<em>T</em> trajectory. This interpretation is consistent with the occurrence of hornblende + plagioclase symplectite around the porphyroblastic garnet, suggesting decompression. We infer that the high-density CO<sub>2</sub> was the dominant <em>syn</em>-metamorphic fluid components present during the granulite-facies metamorphism in the Mettupalayam region. Such carbonic fluids, possibly derived by degassing from carbonates or mantle sources, probably played a significant role in stabilizing high-grade mineral assemblages along this collisional suture zone.</p></div>","PeriodicalId":55973,"journal":{"name":"Chemie Der Erde-Geochemistry","volume":"84 3","pages":"Article 126175"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187183","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
The Yadovitaya fumarole, Tolbachik volcano: A comprehensive mineralogical and geochemical study and driving factors for mineral diversity 托尔巴奇克火山的亚多维塔亚熔岩洞:矿物学和地球化学综合研究及矿物多样性的驱动因素
IF 2.6 3区 地球科学
Chemie Der Erde-Geochemistry Pub Date : 2024-09-01 DOI: 10.1016/j.chemer.2024.126179
Artem S. Borisov , Oleg I. Siidra , Natalia S. Vlasenko , Natalia V. Platonova , Thies Schuldt , Mason Neuman , Harald Strauss , Astrid Holzheid
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