{"title":"印度中部邦德尔坎德邦南部风化闪长岩飞地的地球化学研究","authors":"Khalid M. Ghasera, Shaik A. Rashid","doi":"10.1007/s12517-024-11955-y","DOIUrl":null,"url":null,"abstract":"<p>The present study investigates the chemical weathering characteristics of an amphibolite enclave within granite from Bundelkhand region, central India. The mineral composition varies from core to rind with depletion of hornblende and plagioclase and enrichment of clay minerals and oxyhydroxides. The chemical index of weathering (CIA) indicates an incipient stage of weathering, within the enclave (CIA = 52.22 – 54.74). A-CN-K (Al<sub>2</sub>O<sub>3</sub>-CaO + Na<sub>2</sub>O-K<sub>2</sub>O) plot reveal samples plot along the A-CN line, indicating the removal of Ca and Na, due to plagioclase destruction. The weathering trend progresses towards the formation of smectite, a significant component within the clay composition of the enclave. The results of mass balance calculation reveal a substantial mass decrease of approximately 50% to 82% in the amphibolite. Furthermore, major oxides in the amphibolite enclave, experience significant losses. Trace elements display general losses in the enclave. This study provides valuable insights into the complex dynamics of elemental behavior during weathering by shedding light on the processes shaping the geochemical evolution of these rock types and their response to weathering conditions.</p>","PeriodicalId":476,"journal":{"name":"Arabian Journal of Geosciences","volume":null,"pages":null},"PeriodicalIF":1.8270,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Geochemical investigations of weathered amphibolite enclave from southern Bundelkhand region, central India\",\"authors\":\"Khalid M. Ghasera, Shaik A. Rashid\",\"doi\":\"10.1007/s12517-024-11955-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The present study investigates the chemical weathering characteristics of an amphibolite enclave within granite from Bundelkhand region, central India. The mineral composition varies from core to rind with depletion of hornblende and plagioclase and enrichment of clay minerals and oxyhydroxides. The chemical index of weathering (CIA) indicates an incipient stage of weathering, within the enclave (CIA = 52.22 – 54.74). A-CN-K (Al<sub>2</sub>O<sub>3</sub>-CaO + Na<sub>2</sub>O-K<sub>2</sub>O) plot reveal samples plot along the A-CN line, indicating the removal of Ca and Na, due to plagioclase destruction. The weathering trend progresses towards the formation of smectite, a significant component within the clay composition of the enclave. The results of mass balance calculation reveal a substantial mass decrease of approximately 50% to 82% in the amphibolite. Furthermore, major oxides in the amphibolite enclave, experience significant losses. Trace elements display general losses in the enclave. This study provides valuable insights into the complex dynamics of elemental behavior during weathering by shedding light on the processes shaping the geochemical evolution of these rock types and their response to weathering conditions.</p>\",\"PeriodicalId\":476,\"journal\":{\"name\":\"Arabian Journal of Geosciences\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.8270,\"publicationDate\":\"2024-04-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Arabian Journal of Geosciences\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1007/s12517-024-11955-y\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"Earth and Planetary Sciences\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Arabian Journal of Geosciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/s12517-024-11955-y","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}
Geochemical investigations of weathered amphibolite enclave from southern Bundelkhand region, central India
The present study investigates the chemical weathering characteristics of an amphibolite enclave within granite from Bundelkhand region, central India. The mineral composition varies from core to rind with depletion of hornblende and plagioclase and enrichment of clay minerals and oxyhydroxides. The chemical index of weathering (CIA) indicates an incipient stage of weathering, within the enclave (CIA = 52.22 – 54.74). A-CN-K (Al2O3-CaO + Na2O-K2O) plot reveal samples plot along the A-CN line, indicating the removal of Ca and Na, due to plagioclase destruction. The weathering trend progresses towards the formation of smectite, a significant component within the clay composition of the enclave. The results of mass balance calculation reveal a substantial mass decrease of approximately 50% to 82% in the amphibolite. Furthermore, major oxides in the amphibolite enclave, experience significant losses. Trace elements display general losses in the enclave. This study provides valuable insights into the complex dynamics of elemental behavior during weathering by shedding light on the processes shaping the geochemical evolution of these rock types and their response to weathering conditions.
期刊介绍:
The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone.
Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.