Highly siderophile elements mobility in the subcontinental lithospheric mantle beneath southern Patagonia

被引:35
|
作者
Tassara, Santiago [1 ,2 ]
Gonzalez-Jimenez, Jose M. [3 ]
Reich, Martin [1 ,2 ]
Saunders, Edward [4 ,5 ]
Luguet, Ambre [6 ]
Morata, Diego [1 ,2 ]
Gregoire, Michel [7 ]
van Acken, David [8 ]
Schilling, Manuel E. [9 ]
Barra, Fernando [1 ,2 ]
Nowell, Geoff [10 ]
Corgne, Alexandre [9 ]
机构
[1] Univ Chile, FCFM, Dept Geol, Plaza Ercilla 803, Santiago, Chile
[2] Univ Chile, FCFM, Andean Geothermal Ctr Excellence CEGA, Plaza Ercilla 803, Santiago, Chile
[3] Univ Granada, Dept Mineral & Petrol, Fac Ciencias, Fuentenueva S-N, Granada 180002, Spain
[4] Univ New England, Sch Environm & Rural Sci, Div Earth Sci, Armidale, NSW 2351, Australia
[5] Macquarie Univ, ARC Ctr Excellence Core Crust Fluid Syst GEMOC, Sydney, NSW 2109, Australia
[6] Steinmann Inst Geol, Mineral & Palaotol, D-53115 Bonn, Germany
[7] Toulouse Univ, GET, CNRS, CNES,IRD,UPS,OMP, 14 Av Edouard Belin, F-31400 Toulouse, France
[8] Univ Coll Dublin, Sch Earth Sci, Sci Ctr West, Dublin 4, Ireland
[9] Univ Austral Chile, Fac Ciencias, Inst Ciencias Tierra, Valdivia 5090000, Region De Los R, Chile
[10] Univ Durham, Dept Earth Sci, Sci Labs, Durham DH1 3LE, England
关键词
Subcontinental lithospheric mantle; Metasomatism; Mobility; Highly siderophile elements; Base-metal sulphides; PLATINUM-GROUP ELEMENTS; RE-OS SYSTEMATICS; PERIDOTITE XENOLITHS; GOBERNADOR-GREGORES; TRACE-ELEMENT; GPA; CARBONATED PERIDOTITE; ISOTOPE CONSTRAINTS; ABYSSAL PERIDOTITES; KAAPVAAL CRATON;
D O I
10.1016/j.lithos.2018.06.022
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Peridotite xenoliths collected from alkali basalts in the Argentinian Patagonia reveal the existence of an ancient depleted Paleoproterozoic mantle that records a subsequent multistage metasomatic history. Metasomatism is associated with carbonatite-like melts that evolved, after variable melt/rock ratio interaction, towards CO2-rich and Na-bearing Mg-rich (mafic) silicate, and volatile-rich alkali silicate melts. High degrees of partial melting produced strongly depleted mantle domains devoid of base-metal sulphides (BMS). Moderate degrees of partial melting and later unrelated metasomatism produced a range of slightly depleted, slightly enriched, and strongly enriched mantle domains that preserve different types of BMS. Thus, six different BMS populations were identified including typical residual Type 1A BMS enriched in Os, Ir, and Ru relative to Pt, Pd, and Au located within primary olivine and clinopyroxene, and metasomatic Type 2A BMS that are relatively enriched in Pt, Pd, Au occurring as interstitial grains. Reworking of these two types of BMS by later metasomatism resulted in the formation of a new generation of BMS (Type 1B and Type 2B) that are intimately associated with carbonate/apatite blebs and/or empty vesicles, as well as with cryptically metasomatised or metasomatic clinopyroxene. These newly formed BMS were re-enriched in Os, Pd, Au, Re and in semi-metal elements (As, Se, Sb, Bi, Te) compared to their Type 1A and Type 2A precursors. A third generation of BMS corresponds to Ni-Cu immiscible sulphide mattes entrained within Na-bearing silica under-saturated alkali melt. They occur systematically related to intergranular glass veins and exhibit distinctively near flat CI-chondrite normalised highly siderophile element patterns with either positive Pd (Type 3A) or negative Pt (Type 3B) anomalies. Our findings indicate that Os, Pd, Re and Au can be selectively transported by volatile-rich alkali silicate melts in the subcontinental lithospheric mantle. Moreover, the transport of sulphide mattes entrained in silicate melts is also an effective mechanism to produce HSE endowment in the SCLM and play an important role as precursors of fertile, metal-rich magmas that form ore deposits in the overlying crust. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:579 / 596
页数:18
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