The formation of the giant Huayangchuan U-Nb deposit associated with carbonatite in the Qingling Orogenic Belt

Xue，Shuo1,9; Ling，Ming Xing2; Liu，Yu Long3; Kang，Qing Qing4; Huang，Rui Fang5; Zhang，Zhe Kun1,9; Sun，Weidong6,7,8,9

2020-07-01

10.1016/j.oregeorev.2020.103498

ORE GEOLOGY REVIEWS   影响因子和分区

0169-1368

1872-7360

Carbonatitic magmatism plays a significant role in outgassing carbon from mantle and the formation of rare earth element (REE), rare metal (e.g., Nb and Th) and other types of deposits. The mechanism of REE mineralization associated with carbonatite have been widely studied. However, it is hard to understand U-Nb mineralization without Th enrichment associated with carbonatite. Here we report a carbonatite-hosted U-Nb deposit in Huayangchuan, located in the north Qinling Orogenic Belt. Field observation, mineralogy and geochemical analysis on a suite of drillhole samples were conducted to decipher the mineralization mechanism and its relationship with carbonatite. Huayangchuan carbonatite samples mainly consist of calcite and augite with small volume of accessory minerals (e.g., allanite, fluorapatite, barite and celestite). Betafite [(Ca,U)(Ti,Nb,Ta)O(OH)] is the major ore-bearing mineral in Huayangchuan deposit. The carbonatite shows high CaO, low MgO and alkali contents, which should be products to be differentiated from primary carbonatite (high MgO and alkali contents). The immiscibility and crystallization processes could explain the high CaO/(CaO + MgO + FeO) ratios and the enrichment of LILE. Numerical modeling also indicates positive δO (7.29 to 15.53‰) and negative δC (−5.26 to −10.08‰) shifts are induced by reduced sediments assimilation from source consistent with there being enriched Sr-Nd and low Mg isotopic compositions. LA-ICP-MS zircon U-Pb dating of Huayangchuan carbonatite yielded Triassic ages of 229 ± 3 Ma, which corresponds to the post-collision stage of Qinling Orogen during the middle-late Triassic. We then proposed that the recycling of subducted sediments and later re-melting of those materials in shallow mantle generated the Huayangchuan carbonatite and subsequently formed the Huayangchuan deposit. Fluorine concentration decrease, caused by fluorapatite crystallization, ultimately resulted in betafite mineralization.

Carbonatite Huanyangchuan Qinling Orogenic Belt U-Nb deposit

SCI ; EI

英语

其他

National Key R&D Program of China[2017YFC0602301] ; Guangdong Natural Science Funds[2014A030306032][2015TQ01Z611] ; Youth Innovation Promotion Association CAS[2016315]

Geology ; Mineralogy ; Mining & Mineral Processing

Geology ; Mineralogy ; Mining & Mineral Processing

WOS:000537805900047

ELSEVIER

20201508384070

Magnesia ; Isotopes ; Mineralogy ; Sediments ; Calcite ; Geochronology ; Binary alloys ; Rare earths ; Strontium alloys ; Lead alloys ; Niobium alloys ; Geochemistry ; Iron oxides ; Zircon ; Neodymium alloys ; Ores

Geology:481.1 ; Geochemistry:481.2 ; Geophysics:481.3 ; Mineralogy:482 ; Minerals:482.2 ; Gems:482.2.1 ; Soil Mechanics and Foundations:483 ; Lead and Alloys:546.1 ; Rare Earth Metals:547.2 ; Alkaline Earth Metals:549.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Inorganic Compounds:804.2

GEOSCIENCES

2-s2.0-85082668181

Scopus

1.State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,510640,China
2.State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang,330013,China
3.CAS Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,510640,China
4.Team 224 of Sino Shaanxi Nuclear Industry Group,Xi'an,710100,China
5.SUSTech Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China
6.Center of Deep Sea Research,Institute of Oceanography,Chinese Academy of Sciences,Qingdao,266071,China
7.Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao,266237,China
8.Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao,266071,China
9.University of Chinese Academy of Sciences,Beijing,100049,China

Xue，Shuo,Ling，Ming Xing,Liu，Yu Long,et al. The formation of the giant Huayangchuan U-Nb deposit associated with carbonatite in the Qingling Orogenic Belt[J]. ORE GEOLOGY REVIEWS,2020,122.

Xue，Shuo.,Ling，Ming Xing.,Liu，Yu Long.,Kang，Qing Qing.,Huang，Rui Fang.,...&Sun，Weidong.(2020).The formation of the giant Huayangchuan U-Nb deposit associated with carbonatite in the Qingling Orogenic Belt.ORE GEOLOGY REVIEWS,122.

Xue，Shuo,et al."The formation of the giant Huayangchuan U-Nb deposit associated with carbonatite in the Qingling Orogenic Belt".ORE GEOLOGY REVIEWS 122(2020).