古地理学报2018，Vol.20Issue(1)：49-63,15.DOI:10.7605/gdlxb.2018.01.004
新疆北部地区二叠系幔源碳酸岩质喷积岩研究
Permian mantle-derived carbonatite originated exhalative sedimentary rocks in North Xinjiang
摘要
Abstract
In the Permian Lucaogou epoch,an underfilled intracontinental rift basin was developed in the North Xinjiang,which yields an important source rock of the Lucaogou Formation.A new series of sedimentary rocks that are laminated,thin bedded,carbonate rick and mantle-derived were observed in the source rock and termed as Exhalative Sedimentary Rocks (ESR).The carbonatite ESR in this paper include two types,Effusive Rocks and Explosive Rocks.The thickness of carbonatite Explosive Rocks ranges from 0.5～4 cm.Fine-grained calcite clasts distribute dispersedly in black matrix with various sizes and shapes and display normal grading.The calcite carbonatite originated Effusive rocks are characterized by 2～4 mm laminae and 2～3 cm thin bed,and are intercalated within oil-bearing sedimentary tuffs and tuffaceous dolostones.The calcites represent granular mosaic and zonal structure;homogenization temperatures of fluid inclusions reaches to 435℃.C-O and Sr-Nd isotope compositions indicate the calcite in canbonatite ESR was originated from mantle yet has been largely influenced by interaction with lake water.This study shows that the carbonatite ESR are the product of interaction between mantle-derived carbonatite melt/fluid and fresh lake water.关键词
碳酸岩/岩浆—热液喷流沉积岩/芦草沟组/二叠系/新疆北部地区Key words
carbonatite/magmatic-hydrothermal exhalative sedimentary rocks/Lucaogou Formation/Permian/North Xinjiang分类
天文与地球科学引用本文复制引用
柳益群,周鼎武,南云,焦鑫,李哲萱,李红,周小虎..新疆北部地区二叠系幔源碳酸岩质喷积岩研究[J].古地理学报,2018,20(1):49-63,15.基金项目
国家自然科学基金面上项目(编号:41272116,41572086)和大陆动力学国家重点实验室(西北大学)重点基金(编号:BJ08133-3)联合资助.[Co-funded by General Program of the National Natural Science Foundation of China (Nos.41272116,41572086) and Foundation of State Key Laboratory of Continental Dynamics(Northwest University) (No.BJ08133-3)] （编号:41272116,41572086）
