深海热液金属硫化物矿电性结构

发布时间：2018-05-03 00:13

本文选题：深海热液金属硫化物矿 + TAG热液区　；参考：《地球科学》2016年08期

【摘要】：深海热液金属硫化物矿位于水深数千米的大洋洋底,其形态、规模及电性参数难为人知,迄今尚未有由实测数据推导其电性结构的研究.依托于"大洋一号",在大西洋洋中脊、西南印度洋洋中脊实施了多次深海热液金属硫化物矿探测试验,实地采集热液金属硫化物矿瞬变电磁响应数据,并对试验数据进行反演分析.分析表明:大西洋TAG(trans-Atlantic geotraverse)热液区及西南印度洋49°4′E,37°5′S热液区内,深海热液金属硫化物矿形似生长于洋壳内的"蘑菇",矿体呈透镜状或似层状结构,分布于热液喷口的卤水池内,电阻率约为0.1Ω·m,规模为50~250m,厚度范围为20~50m;热液烟囱直径为10~50m,周围岩石发生热液蚀变,蚀变岩石电阻率在0.2~0.5Ω·m,以热液通道为中心呈圈层状变化.依据深海热液金属硫化物矿的形态特征及电性参数,矿体的电性结构模型可简化为T型异常体.
[Abstract]:Deep-sea hydrothermal metal sulphide deposits are located on the ocean floor thousands of meters deep. Its shape, scale and electrical parameters are difficult to be known. So far, no research has been done to deduce its electrical structure from the measured data. Relying on "Ocean No. 1", several deep-sea hydrothermal metal sulphide ore exploration tests were carried out in the mid-Atlantic ridge and the mid-ocean ridge in south-west India, and transient electromagnetic response data of hydrothermal metal sulphide ore were collected in the field. The experimental data are analyzed by inversion. The analysis shows that in the hydrothermal region of Atlantic TAG(trans-Atlantic geotraverse and in the hydrothermal region of 49 掳4 EN 37 掳5S in the southwest Indian Ocean, the deep sea hydrothermal sulphide deposits resemble the "mushrooms" in the Yu Yang crust, and the orebodies are lenticular or laminar in structure. The resistivity is about 0.1 惟 m, the scale is 50 ~ 250 m, the thickness range is 20 ~ 50 m, and the diameter of the hydrothermal chimney is 10 ~ 50 m. The hydrothermal alteration occurs in the surrounding rock, and the resistivity of the altered rock is 0.2 ~ 0.5 惟 m. Based on the morphological characteristics and electrical parameters of deep-sea hydrothermal metal sulphide ore, the electrical structure model of orebody can be simplified to T-type anomaly.
【作者单位】：中南大学地球科学与信息物理学院;中南大学海洋矿产探测技术与装备研究所;湖南五维地质科技有限公司;
【基金】：大洋“十二五”重大项目(No.DY125-11-R-03) 国家自然科学基金资助项目(No.41304090) 深圳市战略新兴产业发展专项资金项目(No.CXZZ20120618165608947)
【分类号】：P744

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