干旱区生态环境知识资源中心(Arid): Petrogenesis of gold-bearing listvenites from the carbonatized mantle section of the Neoproterozoic Ess ophiolite, Western Arabian Shield, Saudi Arabia

Arid

DOI	10.1016/j.lithos.2020.105679
	Petrogenesis of gold-bearing listvenites from the carbonatized mantle section of the Neoproterozoic Ess ophiolite, Western Arabian Shield, Saudi Arabia
	Gahlan, Hisham A.; Azer, Mokhles K.; Asimow, Paul D.; Al-Kahtany, Khaled M.
通讯作者	Gahlan, HA
来源期刊	LITHOS
ISSN	0024-4937
EISSN	1872-6143
出版年	2020
卷号	372
英文摘要	The variably serpentinized mantle peridotites of the Late Neoproterozoic Ess ophiolite (Western Saudi Arabia) are highly altered along shear zones and thrust planes to form erosion-resistant listvenites. The listvenites are distinguished petrographically and geochemically into three types: carbonate, silica-carbonate and silica (birbirite) listvenites. Geochemical analyses are consistent with expectations from petrography: carbonate listvenite is low in SiO2 content but high in MgO, Fe2O3. and CaO relative to silica-carbonate and birbirite, which is remarkably high in SiO2 at the expense of all other components. The total REE contents are low in silica-carbonate and carbonate listvenites but highly enriched in birbirite, with a large positive Eu anomaly. The host serpentinites have all the characteristics typically associated with highly depleted mantle harzburgite protoliths in supra-subduction fore-arc settings: bulk compositions are low in Al2O3 and CaO with high Mg# [molar Mg/(Mg + Fe)], relict Cr-spinel has high Cr# [molar Cr/(Cr + Al)] and low TiO2 , and relict olivine has high Mg# and NiO content The Cr-spinel relics are also found in the listvenites; those in serpentinite and carbonate listvenites have significantly higher Mg# than those in silica-carbonate and birbirite, suggesting reequilibration of Cr-spinel in the later phases of listvenitization. The varieties of listvenite capture successive stages of fluid-mediated replacement reactions. The carbonate listvenite appears to have developed syncontemporaneously with serpentinization, whereas silica-carbonate listvenite and birbirite formed later. The listvenite formation resulted in leaching and removal of some components accompanied by deposition of others in the solid products, notably CO3, SiO2 , REE (especially Eu). Au, Zn, As, Sb and K. Our data show that listvenitization concentrated gold at sub-economic to economic grades: measured gold concentrations in the host serpentinite are 0.5-1.7 ng/g, versus 4-2569 ng/g in carbonate listvenite, 43-3117 ng/g in silicacarbonate listvenite and 5-281 ng/g in birbirite. The listvenite deposits in the Jabal Ess area merit further exploration for gold. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Arabian Shield Ophiolite Listvenite Fuchsite Sulphides Gold
类型	Article
语种	英语
开放获取类型	Green Accepted, Bronze
收录类别	SCI-E
WOS记录号	WOS:000571822700009
WOS关键词	PRECIOUS-METAL CONCENTRATION ; SOUTH EASTERN DESERT ; MAGNESITE DEPOSITS ; CHROMIAN SPINEL ; ULTRAMAFIC ROCKS ; NUBIAN SHIELD ; PERIDOTITES ; GEOCHEMISTRY ; MINERALOGY ; EVOLUTION
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
来源机构	King Saud University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326439
作者单位	[Gahlan, Hisham A.] King Saud Univ, Dept Geol & Geophys, Riyadh 11451, Saudi Arabia; [Gahlan, Hisham A.] Assiut Univ, Geol Dept, Assiut 71516, Egypt; [Azer, Mokhles K.] Natl Res Ctr, Geol Sci Dept, Cairo, Egypt; [Asimow, Paul D.] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA; [Al-Kahtany, Khaled M.] King Saud Univ, Coll Sci, Seism Studies Ctr, Riyadh 11451, Saudi Arabia
推荐引用方式 GB/T 7714	Gahlan, Hisham A.,Azer, Mokhles K.,Asimow, Paul D.,et al. Petrogenesis of gold-bearing listvenites from the carbonatized mantle section of the Neoproterozoic Ess ophiolite, Western Arabian Shield, Saudi Arabia[J]. King Saud University,2020,372.
APA	Gahlan, Hisham A.,Azer, Mokhles K.,Asimow, Paul D.,&Al-Kahtany, Khaled M..(2020).Petrogenesis of gold-bearing listvenites from the carbonatized mantle section of the Neoproterozoic Ess ophiolite, Western Arabian Shield, Saudi Arabia.LITHOS,372.
MLA	Gahlan, Hisham A.,et al."Petrogenesis of gold-bearing listvenites from the carbonatized mantle section of the Neoproterozoic Ess ophiolite, Western Arabian Shield, Saudi Arabia".LITHOS 372(2020).