1:250 000 Tug, Jangngaidarina, Heihuling and Dogai Coring Sheets in Xizang
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摘要: 地层古生物方面,在原鲁谷组灰岩和火山岩层位之下新发现一套以类复理石沉积为主的深水沉积物,特别是“冰水杂砾岩”;解体了测区南部前泥盆系“戈木日群”浅变质岩系,大部分厘定为二叠系;新发现一套出露较完整的三叠系地层剖面;南羌塘新建3个组级岩石地层单位。构造方面,“中央隆起带”是龙木错-双湖构造带的一部分;测区双湖构造混杂岩带的南北边界均为大型韧性剪切带所分割;新发现上三叠统若拉岗日群岛弧相火山岩;测区南北向新构造调查取得重要进展。油气资源方面,新发现较大规模的沥青脉和几处稠油、油页岩显示点。Abstract: The flyschoid-dominated deep-water sediments especially the "glaciofluvial diamictites" are found to be overlain by the formerly Lugu Formation limestones and volcanic horizons. The pre-Devonian "Gomori Group" shallow metamorphic rock series are mostly redelineated as the Permian strata. A well-exposed Triassic stratigraphic section is constructed. Three formation-scale lithostratigraphic units are established in southern Qiangtang. Tectonically, the "Central Uplift" is interpreted as part of the Lungmuco-Shuanghu tectonic zone. The Shuanghu tectonic mélange zone is separated both at the northern and southern boundaries by giant ductile shear zones. The island-arc volcanic rocks are observed in the Upper Triassic Rola Kangri Group. The important advance has been made for the examination of the NS-trending neotectonics. Abundant larger asphalt veins, heavy oil shows and oil shows are identified in the surveyed areas.
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Keywords:
- 1:250 000 /
- geological survey /
- Tug Sheet /
- Jangngaidarina Sheet /
- Heihuling Sheet /
- Dogai Coring Sheet /
- development /
- Xizang
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