Diagenesis and Sedimentary Environment of Miocene in Lenghu Ⅴ Tectonic Belt
Received date: 2014-03-21
Revised date: 2014-10-22
Online published: 2015-04-10
Based on petrology,mineralogy and geochemistry,the diagenesis,depositional environment and origin of Miocene clastic rock of Shangganchaigou Formation in Lenghu V tectonic belt on the northern margin of the Qaidam Basin were studied.The experimental results demonstrated that particles of Miocene clastic rock of Shangganchaigou Formation mainly had point contact or line contact relationships,and had been suffered strong compaction|the clastic rock of Shangganchaigou Formation had high contents of clay minerals with average value was 22.74%,which were dominated by illite,chlorite and mixed layer of illite and montmorillonite|calcite was the main types of carbonate cements,and dolomite was minor|the carbon isotope (δ13C) of carbonate cements ranged from -6.88‰ to -3.8‰,and the average value was -5.39‰ the oxygen isotope (δ18O) ranged from -12.74‰ to -6.98‰,and the average value was -10.18‰ Z-value of paleosalinity estimated by δ13C and δ18O ranged from 107.65 to 114.89 and the average value was 111.34 and temperature of carbonate deposited ranged from 52.34℃ to 88.93℃,and the average value was 72.08℃.Above results,combined with the comprehensive analysis of some geochemical elements,such as major elements,trace elements and organic carbon content,suggested that main diagenetic stage of Miocene clastic rock of Shangganchaigou Formation in Lenghu V tectonic belt was in phase B of early diagenetic stage B or phase A of the middle diagenetic stage.The depositional environment of Miocene Shangganchaigou Formation in Lenghu V tectonic belt was dominated by stably warm and humid climate,and of which the main diagenesis of reservoirs currently are in period B of early diagenetic stage to period A of the middle diagenetic stage.
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SUN Guo-qiang，CHEN Bo，ZHENG Yong-xian，XIE Mei，XIA Wei-min，SHI Ji-an . Diagenesis and Sedimentary Environment of Miocene in Lenghu Ⅴ Tectonic Belt[J]. Natural Gas Geoscience, 2015 , 26(4) : 679 -688 . DOI: 10.11764/j.issn.1672-1926.2015.04.0679
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