An Prospective Analysis of Ore-searching Work in the Bijiashan Gold Deposit in Dali-Midu Area, Yunnan Province
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摘要: 矿区位于藏东-滇西成矿带南部,扬子准地台与三江褶皱带的过渡部位,属丽江台缘褶皱带的南部。处于金沙江-哀牢山与程海两条深大断裂夹持的倒三角地带。区内出露地层主要有泥盆系下统青山组灰岩、康廊组白云质灰岩及奥陶系下统石英砂岩;岩浆岩有花岗斑岩、二长斑岩、煌斑岩及辉绿岩。从大地构造环境、地球物理条件、地球化学条件、遥感影像、矿区构造条件及岩浆岩条件来分析找矿前景。对比北衙及马厂箐,在本区有找到“北衙式”及“马厂箐式”铜钼金多金属矿的找矿前景。Abstract: The ore district is located in the southern part of the eastern Tibet-western Yunnan metallogenic belt and the transitional position between the Yangtze metaplatform and the Sanjiang folded belt, belonging to the southern part of the Lijiang platform-marginal folded belt and lying in the inverted triangular area sandwiched between Jinshajiang-Ailaoshan deep fault and Chenghai deep fault. The strata exposed in the ore district include limestone of Lower Devonian Qingshan Formation, dolomitic limestone of Kanglang Formation and Lower Ordovician quartz sandstone, whereas the magmatic rocks include granite porphyry, monzonitic porphyry, lamprophyre and diabase. The authors analyzed the ore-searching prospect from such factors as geotectonic environment, geophysical conditions, geochemical conditions, remote-sensing images, and structural and magmatic conditions of the ore district, with a comparison between Beiya area and Machangqing area. It is pointed out that there exists the possibility of finding Beiya type and Machangqing type Cu, Mo polymetallic deposits in the study area.
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Key words:
- geological setting /
- ore-searching prospect /
- structural conditions /
- magmatic rock conditions /
- Bijiashan /
- Dali-Midu
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