日本东北部上津地区田川酸性岩中Obiro矿床的热液活动

IF 1.1 4区 地球科学 Q3 GEOLOGY
Resource Geology Pub Date : 2020-08-18 DOI:10.1111/rge.12244
Yuki Nakajima, Y. Izumino, Shin‐ichi Kagashima, K. Nakashima
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引用次数: 0

摘要

Obiro矿床位于日本东北部上津地区的田川酸性岩(AR)。田川地区由火山期的英安质焊接凝灰岩和深裂期的斑岩花岗闪长岩组成。从矿床中采集钻孔岩心和矿石样品,并采用XRD、EPMA和显微测温法进行了检测。钻芯样品普遍遭受绢云母(伊利石)蚀变,而粉红色的钾长石蚀变晕出现在靠近脉的地方。EPMA和显微测温结果表明,岩浆热液流体发生了如下变化;花岗闪长岩岩浆在700℃、1.0 kb左右侵入水饱和花岗岩固体附近;冷却至约500℃后,流体根据从静压到静压的压力状态变化而沸腾;与大气水混合导致硫化物矿化温度在400°C左右或更低。奥比罗矿床成矿的主要原因有:氧化岩浆侵入较浅的层位,随后热液流体沸腾,形成含盐流体。盐水溶解了铅、锌、铜和铋等金属,这些金属在冷却过程中沉淀下来,伴随着大气水的稀释和pH值的增加,导致溶解度降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydrothermal activity in the Obiro deposit embedded in the Tagawa acidic rocks, Uetsu region, NE Japan
The Obiro deposit is located in the Tagawa Acidic Rocks (AR), Uetsu region, NE Japan. The Tagawa AR is composed of a volcanic phase of dacitic welded tuff and a plutonic phase of porphyritic granodiorite. Drill core and ore samples were collected from the deposit and examined by XRD, EPMA, and microthermometry. The drill core samples have suffered pervasively from sericite (illite) alteration, whereas pinkish K‐feldspar alteration halo occur close to veins. The results of EPMA and microthermometry is interpreted as that the magnatic‐hydrothermal fluids has changed as follows; the granodioritic magma intruded at about 1.0 kb and 700°C near the water‐saturated granite solidus; after cooling to about 500°C the fluids boiled according to a change in the pressure regime from lithostatic to hydrostatic; mixing with meteoric water led to sulfide mineralization at around 400°C or less. The main reasons for the mineralization in the Obiro deposit are as follows; the oxidized magma intruded at a shallower level, and thereafter hydrothermal fluids were boiled, resulting in a saline fluid. The saline fluid then dissolved metals such as Pb, Zn, Cu, and Bi, and these metals precipitated during cooling accompanied by dilution of the meteoric water and increasing pH, resulting in decreasing solubility.
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来源期刊
Resource Geology
Resource Geology 地学-地质学
CiteScore
2.30
自引率
14.30%
发文量
18
审稿时长
12 months
期刊介绍: Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.
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