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首页> 外文期刊>Journal of Remote Sensing & GIS >A Revisit to Vityaz Transform Fault Area, Central Indian Ridge: IsotopicEvidence of Probable Hydrothermal Activity
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A Revisit to Vityaz Transform Fault Area, Central Indian Ridge: IsotopicEvidence of Probable Hydrothermal Activity

机译：中部印度洋脊Vityaz转换断层带的再探：可能的热液活动的同位素证据

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Boron and chlorine isotopes have been used as a proxy for tracing the presence of hydrothermal activity in the CIR area. Isotopic compositions of boron (δ11B) and chlorine (δ37Cl) measured from seawater in a 2000 m water column at Vema (VM3: 10o 43.23’S and 66o 36.5’E) and Vityaz, (VT4: 5o 39.55’S and 68o 03.77’E and VT6: 5o 38.83’S and 67o 27.39’E) transform fault areas in the Central Indian Ridge showed significant variations below 300 m water depth at VT6 relative to VT4 and VM3. An appreciable decrease in δ11B (av. 38.9%o) with a concomitant increase in δ37Cl (av. 1.15%o) by ～1%o below 300 m water depth at VT6, relative to normal seawater value and those at VM3 and VT4, indicated the presence of hydrothermal activity at VT6. This study coupled with earlier studies on serpentinite peridotites from the Vityaz transform fault area showed signatures of low temperature alteration, signifying the presence of hydrothermal activity at around this slow spreading ridge area. The observed features support the possible presence of hydrothermal activity at Vityaz transforms fault area in the Central Indian Ridge.
机译：硼和氯同位素已被用来追踪CIR地区水热活动的存在。在Vema（VM3：10o 43.23'S和66o 36.5'E）和Vityaz（VT4：5o 39.55'S和68o 03.77'）在2000 m水柱中从海水中测得的硼（δ11B）和氯（δ37Cl）同位素组成E和VT6：中印度洋脊的5o 38.83'S和67o 27.39'E）转换断层区域在VT6的水深低于300 m时相对于VT4和VM3表现出显着变化。相对于正常海水值和VM3和VT4处的正常海水值，VT6处水深低于300 m时，δ11B（平均38.9％o）显着降低，同时δ37Cl（平均1.15％o）升高约1％o，表示在VT6处存在水热活动。这项研究与对Vityaz转换断层区蛇纹岩橄榄岩的早期研究相结合，显示出低温蚀变的迹象，这表明在这个缓慢扩散的山脊区域附近存在热液活动。所观察到的特征支持了中印度洋脊Vityaz转换断层区域可能存在热液活动。

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