| 王治华.透岩浆流体成矿理论的应用
-以云南马厂箐铜多金属矿床成矿作用为例[J].地质与勘探,2010,46(Z1):1186-1198 |
| 透岩浆流体成矿理论的应用
-以云南马厂箐铜多金属矿床成矿作用为例 |
| Mineralization Recognition of the Machangqing Polymetallic Deposit in Yunnan Province |
| 投稿时间：2010-10-25 修订日期：2010-11-20 |
| DOI： |
| 中文关键词: 多金属矿床 物质来源 透岩浆流体 地幔流体 云南马厂箐 |
| 英文关键词: polymetallic deposit,origin of ore-forming material,transmagmatic fluid,mantle fluid, Machangqing, Yunnan
1198 |
| 基金项目:国家973 重点基础研究发展计划(编号:2009CB421008)和武警黄金指挥部专项基金(编号:HJ09-03)资助。 |
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| 中文摘要: |
| [摘要]马厂箐铜钼金多金属矿床是西南三江地区的重要矿床之一,对其成因迄今存在争议。本
文报道了新的观测资料,结合前人的研究结果,试图以透岩浆流体成矿理论为指导解释马厂箐矿床的成
因。透岩浆流体成矿作用是罗照华等(2009)提出的一种与国内外矿床学界内生矿床成矿理论主流见解
不同的新理念和新见解。马厂箐铜、钼、金成矿与马厂箐小岩体空间上紧密相伴,时间上相近或稍晚。
马厂箐矿区岩体和矿脉S、C、Pb、H、O、Si 和He、Ar 同位素数据表明:铜、钼矿的成矿物质主要来源于深
部地幔流体(透岩浆流体),金矿成矿物质由深部地幔流体(透岩浆流体)和围岩地层共同提供。马厂箐
的小岩体既有幔源岩石(如煌斑岩),又有壳源岩石(如花岗斑岩),而原生流体则均来自地幔,流体与岩
浆来源的不一致性暗示了透岩浆流体的性质;马厂箐矿床的时空展布特征与透岩浆流体成矿理论的预
测相一致,比传统岩浆热液成矿理论更好地解释了矿床成因;马厂箐矿床是透岩浆流体成矿作用的产
物,主要与区农小岩体群有关,斑状花岗岩体仅仅起着含矿流体的屏蔽作用。马厂箐铜、钼、金多金属矿
是在同一能量驱动机制下,岩浆热压力和地幔流体内压力可能驱动含矿流体在不同的位置上堆积不同
种类的金属,从而在含矿流体通过的路径上发生不同性质的成矿作用,并形成一系列不同类型的矿床,
其铜、钼、金多金属成矿过程可以全部归属为透岩浆流体成矿体系。 |
| 英文摘要: |
| Abstract:The theory of transmagmatic fluid metallogenesis, put forward by Prof. Luo Zhao-hua, is a new concept which is different from the prevail鄄
ing endogenic metallogenic idea in the world. This theory can explain many problems which cannot be interpreted by magma hydrothermal fluids. The
Machangqing copper-polymetallic deposit in Yunnan Province is a typical deposit related to alkali-rich porphyry of the Himalayan period in the Ailaoshan
tectonic belt. Copper, molybdenum and gold mineralization is associated with the rock bodies in Machangqing spatially but late temporally. The alteration
types are related with the granite porphyry rock body clearly. Analysis of isotopic data suggests that the copper and molybdenum ore-forming materials
stemmed primarily from deep mantle fluids (transmagmatic fluids), while that of gold are provided jointly by mantle fluids and country-rocks. Small rock
bodies include both mantle-derived rocks (such as lamprophyre) and crust-derived rocks (such as granite-porphyry). While all the original fluids are
from mantle. The source difference between the fluids and magma implies the nature of transmagmatic fluids. The temporal-spatial distribution of the
Machangqing deposit is in accordance with the prediction of the theory on transmagmatic fluid mineralization, superior to the interpretation of the tradition鄄
al theory that claims magma hydrothermal fluids produce deposits. This deposit is largely associated with small rock bodies, where porphyritic granite plays
merely a role to shield ore-bearing fluids. The formation of the copper, molybdenum, gold and other ores was probably driven by the same mechanism re鄄
lated with magma thermal pressure and inner pressure in mantle fluids, under which various metals might deposit at different positions. Thus mineralization
of varied natures can occur on the pathways of ore-bearing fluids, generating a series of deposits of different types. Such a metallogenic process can be at鄄
tributed to the transmagmatic fluids. |
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