Knowledge Resource Center for Ecological Environment in Arid Area
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
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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). |
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