Source and nature of ore-forming fluids of the Edmond hydro-thermal field, Central Indian Ridge: evidence from He-Ar isotope composition and fluid inclusion study

WANG Yejian; HAN Xiqiu; QIU Zhongyan

doi:10.1007/s13131-016-0963-1

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WANG Yejian, HAN Xiqiu, QIU Zhongyan. Source and nature of ore-forming fluids of the Edmond hydro-thermal field, Central Indian Ridge: evidence from He-Ar isotope composition and fluid inclusion study[J]. Acta Oceanologica Sinica, 2017, 36(1): 101-108. doi: 10.1007/s13131-016-0963-1

Citation:

WANG Yejian, HAN Xiqiu, QIU Zhongyan. Source and nature of ore-forming fluids of the Edmond hydro-thermal field, Central Indian Ridge: evidence from He-Ar isotope composition and fluid inclusion study[J]. Acta Oceanologica Sinica, 2017, 36(1): 101-108. doi: 10.1007/s13131-016-0963-1

Citation:

WANG Yejian, HAN Xiqiu, QIU Zhongyan. Source and nature of ore-forming fluids of the Edmond hydro-thermal field, Central Indian Ridge: evidence from He-Ar isotope composition and fluid inclusion study[J]. Acta Oceanologica Sinica, 2017, 36(1): 101-108. doi: 10.1007/s13131-016-0963-1

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Source and nature of ore-forming fluids of the Edmond hydro-thermal field, Central Indian Ridge: evidence from He-Ar isotope composition and fluid inclusion study

doi: 10.1007/s13131-016-0963-1

Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2016-03-25
Rev Recd Date: 2016-06-14

Abstract

Abstract

To understand the source and nature of the ore-forming fluids of the Edmond hydrothermal field on the Central Indian Ridge, we studied the He-Ar isotope composition and fluid inclusions of the hydrothermal precipitates. Our results show that the sulfide samples contain noble gases He, Ne, Kr, and Xe with their abundances in between those of air-saturated water (ASW) and mid-ocean ridge basalt (MORB). The ³He/⁴He ratio varies from 1.3 to 8.7 R_a(n=10, average:5.1 R_a), whereas the ⁴⁰Ar/³⁶Ar ratio is from 285.3 to 314.7 (n=10, average:294.8). These aa results suggest that the He was derived from a mixture of MORB with variable amounts of seawater, but the Ar in the ore-forming fluids trapped in the sulfides is predominantly derived from seawater. The fluid inclusions of barite have a wide range of homogenization temperatures and salinities varying from 163℃ to 260℃ and 2.6 wt% to 8.5 wt% NaCl equiv., respectively. It is suggested that the ore-forming fluids were produced by phase separation, which agreed with the present-day vent fluid study.
- fluid inclusion,
- helium and argon isotopes,
- phase separation,
- massive sulfides,
- Central Indian Ridge

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References(44)

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