Sequence Stratigraphic Model of Middle Permian Barakar Formation from a Marginal Gondwana Basin, India

作     者：Joyjit Dey Souvik Sen 

作者机构：Coal India Limited Central Mine Planning and Design Institute (CMPD1) Regional Institute-3 Jharkhand 829 103 India Geologix Limited Dynasty Building Level-4 Wing-A Andheri Kurla Road Andheri (E) Mumbai 400 059 India 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2018年第29卷第4期

页      面：745-754页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 

主　　题：fluvial sequence stratigraphy Gondwana sediment Middle Permian Barakar Formation. 

摘      要：Gondwana deposits are extensively found across the continents. Here we study the Mid- dle Permian Barakar Formation from the marginal Gondwana Basin, eastern India, being deposited in a normal fault setting. Availability of extensive cores as well as geophysical log suites （gammaresistivity-density from drilled wells） from the study area helped us achieving high resolution interpretation. Core study identifies fluvial sedimentary architectures, which were correlated with the geophysical logs and modeled field-wide to understand vertical and horizontal facies disposition. The facies analysis has been used to establish a sequence stratigraphic model of the cyclic Barakar deposition. Four major fining upward depositional sequences were identified, each sequence comprises of low accommodation system tract （LAST） at base and high accommodation system tract （HAST） at top. LAST is characterized by vertically stacked, multistory amalgamated channel sandstone dominated facies, while floodplain dominated facies characterizes HAST, reflecting a gradual shift from braided to meandering depositional system from bottom to top of each cycle. Study reveals depocenter to be in the western part, supported by eastward thinning of sediment packets, all being deposited in a halfgraben setting.