干旱区生态环境知识资源中心(Arid): Formation of the Nkob talc deposit by contact metamorphism and fluid infiltration into siliceous dolostones (Moroccan Anti-Atlas)

Arid

DOI	10.1016/j.oregeorev.2021.104629
	Formation of the Nkob talc deposit by contact metamorphism and fluid infiltration into siliceous dolostones (Moroccan Anti-Atlas)
	Chatir, Adil; Berger, Julien; Ennih, Nasser; Triantafyllou, Antoine; de Parseval, Philippe; Errami, Ezzoura; Diot, Herve; Baele, Jean-Marc; Aghzer, Abdel Mohsine; Monnier, Christophe; Boutaleb, Mohammed
通讯作者	Berger, J (corresponding author), Geosci Environm Toulouse, 14 Ave Edouard Belin, F-31400 Toulouse, France.
来源期刊	ORE GEOLOGY REVIEWS
ISSN	0169-1368
EISSN	1872-7360
出版年	2022
卷号	140
英文摘要	The Nkob talc deposit located in the central Anti-Atlas Pan-African belt is hosted by magnesian and siliceous metacarbonates in the contact aureole of the Ediacaran Amassine granite. It consists of a stratified succession of green serpentine-rich marbles, black dolomitic marbles, talcitites and phlogopitites (variously retrogressed into chloritites) enclosed within andalusite metapelite hornfels and quartzites. Two main metamorphic stages have been defined for the formation of the marbles and talcitites: (1) high-temperature recrystallization occurred under amphibolite facies conditions ( 500 degrees C). Temperature increase during granite emplacement led to the formation of forsterite, tremolite, phlogopite (+/- diopside) bearing assemblages in siliceous marbles and to transformation of dolomitic (calcite-free) marbles from pure dolostones. This high temperature stage is also characterized by the growth of andalusite porphyroblasts in the metapelites surrounding the deposit. (2) A low temperature retrograde hydrothermal stage characterized by the reactive infiltration of aqueous silica-rich fluid (presumably derived from the granitic body), in greenschist facies conditions (<520 C). Hydrous silicate minerals, mostly serpentine and talc (+calcite), were formed during this stage within the rocks (after fluid infiltration along grain boundaries) or within veins (marking channeled fluid circulation). Talc in ores formed by two processes at Nkob: acicular talc near the granite formed after the breakdown of tremolite in a temperature range of 350 to 500 degrees C, while tabular talc in the external aureole formed via reaction between dolomite and siliceous-aqueous fluids in temperatures below 350 degrees C. The different types of marbles derive from pure to slightly siliceous dolomite but green and green-black marbles were strongly affected by interactions with siliceousaqueous fluids forming serpentine-phlogopite veins with calcite reaction zones. The talcitite layers were also affected by similar hydrothermal H2O-Si enrichment but their dolomitic precursor probably contained a more important detrital silicate fraction.
英文关键词	Pan-African Marble Serpentine Skarn Contact metamorphism Hydrothermalism
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000731486300001
WOS关键词	WEST-AFRICAN CRATON ; LITHOSTRATIGRAPHIC FRAMEWORK ; PASSIVE MARGIN ; EASTERN DESERT ; ICP-MS ; GEOCHEMISTRY ; ORIGIN ; CHLORITE ; CONSTRAINTS ; MINERALOGY
WOS类目	Geology ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/374389
作者单位	[Chatir, Adil; Ennih, Nasser; Errami, Ezzoura; Aghzer, Abdel Mohsine] Univ Chouaib Doukkali, Fac Sci, Dept Geol, EGGPG, El Jadida, Morocco; [Chatir, Adil; Berger, Julien; de Parseval, Philippe] Univ Toulouse, Observ Midi Pyrenees, UPS, CNRS,IRD,Geosci Environm Toulouse GET, Toulouse, France; [Triantafyllou, Antoine] Univ Claude Bernard Lyon 1, Lab Geol Lyon Terre Planetes & Environm LGL TPE, ENS Lyon, Lyon, France; [Errami, Ezzoura] Univ Cadi Ayyad, Fac Polydisciplinaire Safi, Got, Safi, Morocco; [Diot, Herve; Monnier, Christophe] Univ Nantes, Lab Planetol & Geodynam LPG Nantes, UMR CNRS 6112, Nantes, France; [Diot, Herve] Univ La Rochelle, La Rochelle, France; [Baele, Jean-Marc] Univ Mons, Geol & Appl Geol Unit Min Geol, 20 Pl Parc, B-7000 Mons, Belgium; [Boutaleb, Mohammed] Consulting & Min Dev, Marrakech, Morocco
推荐引用方式 GB/T 7714	Chatir, Adil,Berger, Julien,Ennih, Nasser,et al. Formation of the Nkob talc deposit by contact metamorphism and fluid infiltration into siliceous dolostones (Moroccan Anti-Atlas)[J],2022,140.
APA	Chatir, Adil.,Berger, Julien.,Ennih, Nasser.,Triantafyllou, Antoine.,de Parseval, Philippe.,...&Boutaleb, Mohammed.(2022).Formation of the Nkob talc deposit by contact metamorphism and fluid infiltration into siliceous dolostones (Moroccan Anti-Atlas).ORE GEOLOGY REVIEWS,140.
MLA	Chatir, Adil,et al."Formation of the Nkob talc deposit by contact metamorphism and fluid infiltration into siliceous dolostones (Moroccan Anti-Atlas)".ORE GEOLOGY REVIEWS 140(2022).