煤田地质与勘探2016，Vol.44Issue(2)：8-13,6.DOI:10.3969/j.issn.1001-1986.2016.02.002
川东金刚矿区须家河组层序-古地理及聚煤特征
Sequence-paleogeography and coal -accumulation of Xujiahe Formation in Jingang mining area of eastern Sichuan basin
摘要
Abstract
Sequence-paleogeography and coal-accumulating characteristics of the Late Triassic Xujiahe Formation in Jingang mining area of eastern Sichuan basin were studied based on the data from outcrops, borehole cores, and geophysical logging. According to the color discontinuity surface of strata, basal erosional surfaces of the incised valley filled with sandstone and the vertical facies reversal surface, four third-order sequences were subdivided in Xujiahe Formation, in which sequence III and sequence IV representing the coal-bearing members in the study area, were corresponding respectively to the intervals from member 4 to member 5 and from member 6 to member 7. Taking the third order sequences as the mapping unit, we have reconstructed the lithofacies-paleogeography pattern of sequence III and sequence IV. During deposition of sequence III and sequence IV, the main paleogeographical units were the meandering river and fluvial delta, with Jiangnan Oldland to the east as the major provenance. The mineable coal seams were mainly developed in the transgressive systems tract (TST), with relatively thick coals in sequence IV. The coal in sequence III was deposited in the interdistributary bay of the lower delta plain environ-ment and the coal in sequenceIV was formed in the back swamp of the meandering river environment.关键词
金刚矿区/上三叠统/须家河组/层序地层/古地理/聚煤特征Key words
Jingang mining area/Upper Triassic/Xujiahe Formation/sequence stratigraphy/palaeogeography/coal-accumulating characteristics分类
天文与地球科学引用本文复制引用
周倩羽,邵龙义,陈照雄,李明彬,李浩然..川东金刚矿区须家河组层序-古地理及聚煤特征[J].煤田地质与勘探,2016,44(2):8-13,6.基金项目
国家科技重大专项课题(2016ZX05027-001)；河南省生物遗迹与成矿过程重点实验室2013-2014年度开放课题(OTMP1408)@@@@National Science and Technology Major Project (2016ZX05027-001)；The Open Project of Henan Province Key Laboratory of Biological Relics and Ore-forming Process during 2013 to 2014(OTMP1408) （2016ZX05027-001）
