Platinum-group element geochemistry of the Panjal Traps: constraints on mantle melting and implications for mineral exploration

J. Gregory Shellnutt*, Kwan Nang Pang, Liang Qi, Ghulam M. Bhat

*此作品的通信作者

研究成果: 書貢獻/報告類型篇章

1 引文 斯高帕斯(Scopus)

摘要

Forty-two volcanic rocks of the Panjal Traps were analysed for platinum-group elements (PGEs) to investigate the magma genesis, high-temperature behaviour and exploration potential of these elements. The PGE data exhibit substantial variability and show no systematic relation to their low-or high-Ti affinity. Instead, the basalts can be subdivided into a PGE-undepleted group (group 1) that has ΣPGE .10 ppb and Cu/Pd,30 000, and a PGE-depleted group, which consists of a subgroup showing limited (group 2A) or substantial depletion in Ir-series PGEs relative to Ni (group 2B). The group 1 samples indicate an S-undersaturated history, whereas the group 2 samples might have different origins in terms of S-saturation. Fractionation of a tiny amount of sulfide melts (0.075–0.1%) from a representative group 1 sample accounts for the chalcophile element patterns observed in the group 2B samples. The relatively high Cu/Pd, unfractionated Ni/Ir and low PGE abundances observed in the group 2A samples cannot be explained by equilibration of an immiscible sulfide melt alone, and probably require decomposition of residual sulfides into sulfide melt and a monosulfide solid solution in the mantle restite. Our results question the notion that the coexistence of PGE-undepleted and-depleted magmas is prospective in the exploration of magmatic Ni–Cu–(PGE) sulfide mineralization.

原文英語
主出版物標題Geological Society Special Publication
發行者Geological Society of London
頁面531-551
頁數21
版本1
DOIs
出版狀態已發佈 - 2022

出版系列

名字Geological Society Special Publication
號碼1
518
ISSN(列印)0305-8719

ASJC Scopus subject areas

  • 水科學與技術
  • 海洋工程
  • 地質學

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