| 陈振兴,贾波,刘万顺,董想平,韩成,谢升浪.青海省尕牙合铜镍矿床地质特征及成矿预测[J].矿产勘查,2022,13(11):1632-1639 |
| 青海省尕牙合铜镍矿床地质特征及成矿预测 |
| Geological characteristics and metallogenic prediction of the Gayahe copper nickel deposit in Qinghai Province |
| 投稿时间：2022-06-27 |
| DOI：10.20008/j.kckc.202211005 |
| 中文关键词: 青海省 尕牙合 超基性岩 铜镍硫化物 成矿预测 |
| 英文关键词: Qinghai Province gayahe ultrabasic rock copper nickel sulfide metallogenic prediction |
| 基金项目:本文受青海省清洁能源矿产专项资金“青海省格尔木市尕牙合地区镍多金属矿预查”项目(QDDJ/QJNY(KC)2020)资助。 |
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| 中文摘要: |
| 尕牙合铜镍矿床位于东昆仑造山带东段,产于基性—超基性杂岩体中,区内圈定3处规模不等的基性—超基性杂岩体∑1、∑2、∑3,岩体多呈北西至南北向分布,长105~700 m、宽100~230 m,主要岩性为橄榄辉石岩、橄榄辉石角闪石岩、角闪辉长岩等,橄榄辉石岩中普遍发育(稀疏)浸染状、星点状分布的磁黄铁矿、镍黄铁矿、黄铜矿等,并发育镍华、孔雀石化。通过前期槽探揭露,圈定铜钴镍矿体1条、矿化体3条。本文通过总结成矿地质特征、矿化规律,认为镁铁—超镁铁质岩体的分布严格受深大断裂控制,而矿(化)体又严格受其控制。寻找该类型含矿岩体时,提出以Cu、Co、Ni、Cr为组合的1∶5万水系沉积物异常和具有高密度、高磁性、高极化率、低电阻率的物探异常是重要的找矿标志。与典型矿床对比,认为该区具有较好的岩浆铜镍矿床成矿远景。 |
| 英文摘要: |
| Gayahe copper nickel deposit is located in eastern section of the East Kunlun Orogen and occurs in basic ultrabasic complex. There are three basic ultrabasic rock bodies Σ 1, Σ 2 and Σ 3 with different scales in the inner circle of the area. The rock bodies are mostly distributed in the nw-ns direction, with a length of 105~700m and a width of 100~230 m. The main lithology is olivine pyroxenite, olivine pyroxene hornblende and hornblende gabbro. In the olivine pyroxene rocks, there are (sparsely) disseminated Pyrrhotite, pyrrhotite, chalcopyrite, etc. are distributed in a star shape, and nickel tufa and malachitization are seen. Through trenching, one copper cobalt nickel ore body and three mineralized bodies are delineated. By summing up the metallogenic geological characteristics and mineralization laws, the paper considers that the distribution of mafic ultramafic rock mass is strictly controlled by deep and large faults, and the ore (chemical) body is strictly controlled by them. When looking for this type of rock mass, it is proposed that the 1∶50000 stream sediment anomaly with Cu, Co, Ni and Cr as a combination and the geophysical prospecting anomaly with high density, high magnetic, high polarization and low resistivity are important prospecting indicators, it is considered that this area has a good metallogenic prospect for magmatic copper nickel deposit. |
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