干旱区生态环境知识资源中心(Arid): Petrology and geochemistry of high-Al chromitites from the Medellin Metaharzburgitic Unit (MMU), Colombia

Arid

DOI	10.18268/BSGM2020v72n3a120620
	Petrology and geochemistry of high-Al chromitites from the Medellin Metaharzburgitic Unit (MMU), Colombia
	Hernandez-Gonzalez, Juan S.; Butjosa, Lidia; Pujol-Sola, Nuria; Aiglsperger, Thomas; Weber, Marion; Escayola, Monica; Ramirez-Cardenas, Carlos; Blanco-Quintero, Idael F.; Maria Gonzalez-Jimenez, Jose; Proenza, Joaquin A.
通讯作者	Pujol-Sola, N
来源期刊	BOLETIN DE LA SOCIEDAD GEOLOGICA MEXICANA
ISSN	1405-3322
出版年	2020
卷号	72 期号:3
英文摘要	The Medellin Metaharzburgitic Unit (MMU), emplaced onto the western continental margin of Pangea during Triassic titre, is located in the Central Cordillera of Colombia and consists of metaharzburgites, minor metadunites and chromitite bodies (Patio Bonito and San Pedro ore deposits). The ultraniafic rocks contain relicts of mantle-derived chromian spina arid minor orthopymxene, and a later metamorphic mineral assemblage composed by treniolite, chlorite, talc, fine-grained recrystallized olivine, serpentine-group minerals, magnetite, arid secondary chromian spinel, formed during the thermal evolution of the unit. The Cr# [Cr/(Cr+Al) atomic ratio of the accessory primary chromian spinal in the metaperidotites ranges from 0.58 to 0.62 and overlaps those of supra-subduction peridotites from ophiolites. According to textural and compositional variations, the accessory chroutian spina in the metaperidotites can he classified into three groups: i) partially altered chromian spinel with an Al-rich core, ii) porous, Cr-Fe(2+)enriched and Al-Mg-depleted chromian spinel, and iii) homogeneous re'-rich chromian spinel. These variations can be related to superimposed medium-T metamorphism that reached runphibothe facies (ca. 60(1 degrees C). Chrontitite bodies associated with the metaperidotites have massive and semi-massive textures, and mainly consist of chromian spina crystals, which show large unaltered cores surrounded by thin alteration rims of ferrian chrdnian spina and chlorite. Chromitites are (#Cr <0.6) and strongly depleted in platinum group demerits (Sigma PGE <41 ppb). The primary petrological and geochemical characteristics preserved in the metaperidotites and chromitites indicate that the MMU formed at shallow levels of a suboceanic lithospheric mantle related to a supra-subduction zone (back-arc basin/incipient an: scenario), and that the chmmitites crystallized from a tholeihic magma (back-arc basin basalt type).
英文关键词	Metaperidotite chromien spinel chromitite ophiolite supra-subduction zone Colombia
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000594074800011
WOS关键词	PLATINUM-GROUP ELEMENTS ; OPHIOLITIC BELT ; DEPLETED PERIDOTITES ; CHROMIAN SPINEL ; CR-SPINEL ; MANTLE ; SERPENTINITES ; PETROGENESIS ; COMPLEX ; ORIGIN
WOS类目	Geology
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327753
作者单位	[Hernandez-Gonzalez, Juan S.; Butjosa, Lidia; Pujol-Sola, Nuria; Ramirez-Cardenas, Carlos; Proenza, Joaquin A.] Univ Barcelona, Dept Mineral Petrol & Geol Aplicada, Fac Ciencies Terra, C Marti i Franquits S-N, Barcelona 08028, Spain; [Hernandez-Gonzalez, Juan S.] Univ Sao Paulo, Dept Mineral & Geotect, Inst Geociencias GMG IGc, Rua Lago 562, BR-05508080 Sao Paulo, Brazil; [Aiglsperger, Thomas] Lulea Univ Technol, Dept Civil Engn & Nat Resources, Div Geosci & Environm Engn, SE-97187 Lulea, Sweden; [Weber, Marion] Univ Nacl Colombia, Dept Geociencias & Medio Ambiente, Fac Minas, Ave 80 65-223, Medellin 050034, Colombia; [Escayola, Monica] Univ Tierra del Fuego CONICET, Inst Ciencias Polares & Amlientales ICPA, Fueguia Basket 251, RA-9410 Ushuaia, Tierra Del Fueg, Argentina; [Blanco-Quintero, Idael F.] Univ Alicante, Dept Ciencias Tierra & Medio Ambiente, Carretera San Vicente del Raspeig S-N, Alicante 03690, Spain; [Maria Gonzalez-Jimenez, Jose] Univ Granada, Dept Mineral & Petrol, Fac Ciencias, Avda Fuente...
推荐引用方式 GB/T 7714	Hernandez-Gonzalez, Juan S.,Butjosa, Lidia,Pujol-Sola, Nuria,et al. Petrology and geochemistry of high-Al chromitites from the Medellin Metaharzburgitic Unit (MMU), Colombia[J],2020,72(3).
APA	Hernandez-Gonzalez, Juan S..,Butjosa, Lidia.,Pujol-Sola, Nuria.,Aiglsperger, Thomas.,Weber, Marion.,...&Proenza, Joaquin A..(2020).Petrology and geochemistry of high-Al chromitites from the Medellin Metaharzburgitic Unit (MMU), Colombia.BOLETIN DE LA SOCIEDAD GEOLOGICA MEXICANA,72(3).
MLA	Hernandez-Gonzalez, Juan S.,et al."Petrology and geochemistry of high-Al chromitites from the Medellin Metaharzburgitic Unit (MMU), Colombia".BOLETIN DE LA SOCIEDAD GEOLOGICA MEXICANA 72.3(2020).