| 陈常富,郭志远,胡京宇,蒋明霞.山东沂南金厂金铜矿床构造、岩浆演化与成矿模式[J].地质找矿论丛,1995,(1):9-15 |
| 山东沂南金厂金铜矿床构造、岩浆演化与成矿模式 |
| TECTONIC MAGMATIC EVOLUTION AND METALLOGENIC MODEL FOR JINCHANG Au-Cu DEPOSIT, YINAN AREA, SHANDONG PROVINCE |
| 投稿时间：1994-08-01 修订日期：1994-12-01 |
| DOI：10.6053/j.issn.1001-1412.1995.1. 002 |
| 中文关键词: 矽卡岩型金铜矿床 穹窿构造 岩浆演化 成矿模式 |
| 英文关键词: |
| 基金项目: |
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| 中文摘要: |
| 本文系统总结了该矿床穹窿构造和岩浆演化的特征,并提出简要的成矿模式。 |
| 英文摘要: |
| Jinchang Au-Cu deposit is a middle size skarn ore deposit locating at the margin of Yiyuan-Yinan fault depression and neighbouring Yishu rift system in the east and Luxi blok in the west.Since Mesozoic multi-directional stretching at different levels resutling in differential rise and depression thus the coexisting domes and basin, deep-seated cutting of Tan-Lu rift vally and ridge-like doming of the mantle all play roles in providing condition for magmatic activity in the area.The NE fracture from Chaolinzhuang to Jinchang and the NW fracture from Mamuchi to Jinchang are the main rock-control tectonics.They confine not only the neck, rediate dyke groups of the complex body but also the dome formation.Jinchang sub-volcaivc complex body consists of diorite porphyrite, granitic diorite, granitic porphyry, felsitic porphyry, subrhyolitic porphyry, micro-crytailine monzonitic porphyry and syenite.The rock body is higher in K and Na characterized by enrichement of k, ie, Na2O/K2O=0.45～0.71, Cal-alkali index=50.8-57.9 A·R-index=9.93-5.82 and The projecting points in the A·R-SiO2 plot imply that the complex body is of cal-alkali, alkali rock.G.V.R-A.R plot show a tectonic-magmatic active zone near the axis of a active continental margin rift valley of a subduction zone for the magmatism.Srisotope and biotite plot show enrichment of LREE and K,Al implying an apparent source from K-Si-Al crustal layer of Taishan Group.Yanlingguan Fomation of Taishan Group has an average Au value being 125 times of clark value.The formation could supply Au, Cu for Jinchang ore deposit.Neck of the complex rock body, the interlayer fracture zones(about the contact between the body and Middle-lower Cambrian Carocks) and detatchment zones cut by circular and rediate dyke groups create a semi-closed metallogenic system.Ore bodies occur as overlaped ring belts along bedding in skarn.Au, Cu are the key elenents companied by Ag, S, Mo, Pb and Zn.The deposit is a typical skarntype in the East China. |
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