Based on detailed field surveys,numerous sections and drillcores as well as analyses of lithofacies and sedimentary facies,sedimentary differentiation in the Middle Permian Zunyi(northern Guizhou,South China)trough ba...Based on detailed field surveys,numerous sections and drillcores as well as analyses of lithofacies and sedimentary facies,sedimentary differentiation in the Middle Permian Zunyi(northern Guizhou,South China)trough basin was studied in detail.Caused by activities of the Emeishan mantle plume,the regional extensional setting and the extinguishing of carbonate production factories were shown from Guizhou to Yunnan.Three types of sedimentary enironments were developed in the study area:platform,slope,and basin.In this work,we established a sedimentary model for the study area,identified 14 syndepositional faults,and created the detailed reconstruction of the trough basin via a sedimentological investigation.It is found that the paleogeographic evolution of the study area can be divided into six stages:(1)a pre-rifting stage,(2)rapid rifting and subsidence,(3)stable rifting and subsidence,(4)the second stage of rifting and subsidence,(5)silicification,and(6)regional uplift and denudation.The sedimentary features and paleogeographic evolution of the Maokou Formation in Zunyi show that the platform,slope,and basin sedimentary features coexisted.In addition,the extensional setting and extinguishing of carbonate production factories were important preconditions for the evolution of the platform region in the study area,and the activity of syndepositional faults also played an important role in the paleogeographic evolution of this area.展开更多
贵州遵义铜锣井大型锰矿床位于鄂渝湘黔前陆褶皱冲断带西部,遵义次级成矿亚带的深溪-八里锰矿矿带。矿区主要出露地层为寒武系第三统-芙蓉统、奥陶系下统娄山关组,奥陶系下统桐梓组、红花园组、中-下统湄潭组,二叠系阳新统梁山组、栖霞...贵州遵义铜锣井大型锰矿床位于鄂渝湘黔前陆褶皱冲断带西部,遵义次级成矿亚带的深溪-八里锰矿矿带。矿区主要出露地层为寒武系第三统-芙蓉统、奥陶系下统娄山关组,奥陶系下统桐梓组、红花园组、中-下统湄潭组,二叠系阳新统梁山组、栖霞组、茅口组,乐平统龙潭组、长兴组地层,三叠系下统夜郎组、中-下统嘉陵江组、中统关岭组地层,第四系。锰矿体产于二叠系阳新统茅口组第三段含锰岩系下部,呈层状、似层状产出,矿石结构主要为内碎屑结构,纹层状、斑杂状、块状构造,矿体厚度与含锰岩系厚度呈正相关,矿体厚度为0.3~3.5 m, Mn品位为12%~31%,平均为19.27%。展开更多
基金supported by the Young Talent Funding of Guizhou Province(No.2019-5654)the China Geological Survey(CGS)(No.DD20190159-16)+5 种基金the Guizhou Science Innovation Team Project(No.2018-5618)the Natural Science Funding of Guizhou(Nos.2019-2868 and 2019-2951)the Research Funding of Guizhou Bureau of Geology and Mineral Exploration and Development(No.2016-3)the Bureau of Geology and Mineral Resources Exploration and Development Major Research Project of Guizhou Province(Guizhou Geology and Mining Sci-Coop[2021]03)the Science and Technology Plan Projectof Guizhou Province(Guizhou Sci-Zhongyindi No.[2021]4027)the Prospecting Breakthrough Strategic Action Major Collaborative Innovation Project of Guizhou Province(No.2022[ZD003]).
文摘Based on detailed field surveys,numerous sections and drillcores as well as analyses of lithofacies and sedimentary facies,sedimentary differentiation in the Middle Permian Zunyi(northern Guizhou,South China)trough basin was studied in detail.Caused by activities of the Emeishan mantle plume,the regional extensional setting and the extinguishing of carbonate production factories were shown from Guizhou to Yunnan.Three types of sedimentary enironments were developed in the study area:platform,slope,and basin.In this work,we established a sedimentary model for the study area,identified 14 syndepositional faults,and created the detailed reconstruction of the trough basin via a sedimentological investigation.It is found that the paleogeographic evolution of the study area can be divided into six stages:(1)a pre-rifting stage,(2)rapid rifting and subsidence,(3)stable rifting and subsidence,(4)the second stage of rifting and subsidence,(5)silicification,and(6)regional uplift and denudation.The sedimentary features and paleogeographic evolution of the Maokou Formation in Zunyi show that the platform,slope,and basin sedimentary features coexisted.In addition,the extensional setting and extinguishing of carbonate production factories were important preconditions for the evolution of the platform region in the study area,and the activity of syndepositional faults also played an important role in the paleogeographic evolution of this area.
文摘贵州遵义铜锣井大型锰矿床位于鄂渝湘黔前陆褶皱冲断带西部,遵义次级成矿亚带的深溪-八里锰矿矿带。矿区主要出露地层为寒武系第三统-芙蓉统、奥陶系下统娄山关组,奥陶系下统桐梓组、红花园组、中-下统湄潭组,二叠系阳新统梁山组、栖霞组、茅口组,乐平统龙潭组、长兴组地层,三叠系下统夜郎组、中-下统嘉陵江组、中统关岭组地层,第四系。锰矿体产于二叠系阳新统茅口组第三段含锰岩系下部,呈层状、似层状产出,矿石结构主要为内碎屑结构,纹层状、斑杂状、块状构造,矿体厚度与含锰岩系厚度呈正相关,矿体厚度为0.3~3.5 m, Mn品位为12%~31%,平均为19.27%。
