滇西北普朗斑岩铜矿与成矿有关的花岗岩与全球埃达克岩的对比:大数据研究的初步结果  

Comparative study on mineralizationrelated granite of Pulang porphyry copper deposit in northwestern Yunnan and global adakite: The preliminary results of big data research

作　　者：刘学龙[1] 李文昌[1,2] 张娜[1] 朱俊[1] 罗应 杨富成[1] 张昌振 王帅帅 

机构地区：[1]昆明理工大学,昆明650093 [2]中国地质调查局成都地质调查中心,成都610081

出　　处：《岩石学报》2018年第2期289-302,共14页Acta Petrologica Sinica

基　　金：云南省科学技术奖-杰出贡献奖项目(2017001);昆明理工大学重点学科建设经费(1407839305);昆明理工大学省级人培项目(KKSY201421042);云南省科技领军人才计划项目(2013HA001);国家自然科学基金项目(41502076)联合资助

摘　　要：云南格咱岛弧是西南三江构造-岩浆岩带中义敦岛弧的重要组成部分,位于义敦岛弧带的南端,是中国西部地区一个重要的铜铅锌多金属成矿带和印支期斑岩铜矿带,其中普朗斑岩型铜矿是印支期斑岩铜矿的典型代表。本文在前人研究基础上,采用大数据分析技术,对普朗斑岩铜矿与成矿有关的花岗岩与全球埃达克岩进行了对比研究,得到506个元素组合,获得交叠率比值127765个。结果表明,普朗斑岩与全球埃达克岩的地球化学数据基本上重叠,具有与全球埃达克岩类似的特征;但Cu、Mo、Pb、Zn成矿元素明显超出全球埃达克岩的分布范围,REE和Ga与主元素的比值虽然在全球埃达克岩范围内,却显示了位于全球埃达克岩某个端元的现象。另外,与斑岩铜矿有关的埃达克岩分布于全球埃达克岩范围的局部,数据部分或大部分逸出了全球埃达克岩分布的范围,具有低Sr/Cu、Ta/Cu、Al/Mo、Mn/Zn、Mn/Cu、Mn/Mo以及Hf、K、Ti、P、Co、Th、Ca/Cu比值的特征,数据点偏离全球埃达克岩范围越远,蚀变与矿化作用越强烈,与铜钼成矿关系越密切。本文地球化学数据挖掘结果可以作为找矿标志来使用,这为普朗铜矿床深部及外围的地质找矿提供了新的科学依据。The Geza arc is an important part of the Yidun Island arc in Sanjiang tectonic-magmatic rock belt. It is located at the southern tip of the Yidun island arc belt. It is an important copper-lead-zinc polymetallic metallogenic belt and Indosinian porphyry copper belt in the western region of China. Pulang porphyry copper deposit is a typical representative of the Indosinian porphyry copper deposits. Based on the previous studies, the big data analysis technique was used to make a contrastive study of the ore-forming related granite in Pulang porphyry copper deposit and the global adakite. As a result, 506 element combinations and 127765 overlap ratios were obtained. The result shows that the geochemical data of the Pulang porphyry are basically overlapped with the global adakite, and have similar characteristics with the global adakite. However, the Cu, Mo, Pb and Zn metallogenic elements are significantly higher than those of the global adakite, and although the ratios of REE and Ga to the major element are in the range of the global adakite, they show the phenomenon of an end member in the global adakite. In addition, the adakite associated with porphyry copper deposits are distributed partially in the global adakite, and some or most of the data are out of the distribution range of the global adakite, and with characteristics of low Sr/Cu, Ta/Cu, Al/Mo, Mn/Zn, Mn/Cu, Mn/Mo and Hf, K, Ti, P, Co, Th, Ca/Cu. The farther the data points deviate from the global adakite range, the stronger the alteration and mineralization are, and the closer the relationship with copper and molybdenum mineralization is. The geochemical data mining results can be used as a prospecting indicator, which can provide a new scientific basis for the geological prospecting of the deep and periphery of the Pulang copper deposit.

关 键 词：斑岩型铜矿 花岗岩 埃达克岩 地球化学 数据挖掘 普朗 滇西北 大数据 

分 类 号：P628.4[天文地球—地质矿产勘探]