中国地质2024，Vol.51Issue(2)：592-605,14.DOI:10.12029/gc20200621001
塔里木盆地西南部晚白垩世—早古新世沉积环境演化:来自皮山PBX1井的地化证据
Late Cretaceous to Early Paleocene sedimentary environment evolution:Geochemical evidences of Well PBX1 in the southwestern Tarim Basin
摘要
Abstract
This paper is the result of geological survey engineering. [Objective]The catastrophe and extinctions that occurred in Late Cretaceous is during geological history make the K/Pg boundary become one of the most important geological boundaries in the world.The study of Late Cretaceous-Early Paleocene sedimentary environment evolution of Tarim is helpful to reconstruct the paleogeography in the northern Tethys basins.[Methods]This study employs the sensitivity index analysis of geochemical elements from core samples of Well PBX1 located in the southwestern Tarim Basin to investigate the environment evolution associated with the K/Pg boundary.[Results]The climate was hot and dry in Late Cretaceous and transitioned to a short-term warm and humidity environment in Early Paleocene.The paleo-salinity changed from normal marine environment in Late Cretaceous to brackish water or marine to saline lake in Early Paleocene.The salinity reached minimum at the K/Pg boundary.For redox environment,it experienced the oxic to anoxic environment and weak redox environment in Late Cretaceous to a short-term oxic environment near the boundary to a major anoxic and weak redox environment in Early Paleocene.[Conclusions]The geochemical element sensitivity index of well PBX1 reveals the response characteristics of the catastrophic anomaly event between Cretaceous and Paleocene in the Tarim Basin,which is effective evidence of the of Late Cretaceous-Early Paleocene sedimentary environment evolution in the northern basins of Tethys Ocean.关键词
环境演化/干热型/湿热型/白垩纪—古近纪界线/PBX1井/地质调查工程/塔西南Key words
sedimentary environment evolution/hot and dry type/warm and humidity type/K/Pg boundary/Well PBX1/geological survey engineering/southwestern Tarim Basin分类
天文与地球科学引用本文复制引用
岳勇,蒋恕,田景春,林新..塔里木盆地西南部晚白垩世—早古新世沉积环境演化:来自皮山PBX1井的地化证据[J].中国地质,2024,51(2):592-605,14.基金项目
中国地质调查局项目"雪峰古陆周缘页岩气地质调查"(DD20190558)与国家重点研发计划项目课题(2022YFF0801202)联合资助. Supported by the projeets of China Geological Survey"Geological Survey of Shale Gas around Xuefeng Ancient Land"(No.DD20190558)and National Key R&D Program(No.2022YFF0801202). （DD20190558）
