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青东中部,即指以东经101度,北纬35度为中心,包括青海黄南藏族自治州全境,西跨海南州黄河地域,东濒甘、青交界,南北各至黄河的地区。谌称黄河上游之河曲地区。一、沉积建造出露地层有前震旦系、上古生界、中生界和新生界等。前震旦系分布在北部尖扎-循化一带,岩性为一套深变质的花岗片麻岩、混合岩、变粒
The middle part of Qing dynasty refers to the east of 101 degrees and the north latitude of 35 degrees as the center, including the entire territory of Qinghai Huangnan Tibetan Autonomous Prefecture, the west across the Yellow River region of Hainan, east Gan, Qing junction, north and south to the Yellow River region. Chen said Hequ region on the upper reaches of the Yellow River. First, the sedimentary formation of exposed strata before the Sinian, Upper Paleozoic, Mesozoic and Cenozoic and so on. The former Sinian is distributed in the Jianjian-Xunhua area in the north of the country. The lithology is a set of deep metamorphic granitic gneiss, mixed rocks,