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Mineralisation associated with the fractionated Cretaceous Baoshan Monzogranite: Tectonic implications for South China

Published on Nov 1, 2018in Ore Geology Reviews 3.99
· DOI :10.1016/j.oregeorev.2018.08.008
Zhiqiang Zhang (China University of Geosciences), Leon Bagas20
Estimated H-index: 20
(UWA: University of Western Australia)
+ 2 AuthorsBin Fu3
Estimated H-index: 3
(ANU: Australian National University)
Abstract
Abstract Jurassic and Late Cretaceous granites are spatially and temporally associated with mineralisation in the Paleozoic Dayaoshan Terrane in South China (also known as South China Block). The porphyritic Baoshan Monzogranite of Late Cretaceous is an example that is petrographically studied in this contribution. Sensitive High-Resolution Ion-Microprobe (SHRIMP) zircon U-Pb ages, in-situ zircon O-Hf isotopic analyses, and whole-rock geochemistry are here used to better constrain the genesis of the monzogranite, which is porphyritic, and located in the Baoshan Cu mining area. SHRIMP zircon dating yields a weighted mean 206 Pb/ 238 U age of 89 ± 1 Ma, interpreted to be the crystallisation age of the porphyritic monzogranite. Its geochemical data indicates it is derived from partial melting of the lower to crust, followed by fractionation, and emplacement in secondary faults related to the major Bobai-Cenxi Fault. The monzogranite has a Paleo- to Mesoproterozoic source in the crust, which was metasomatised during Neoproterozoic subduction. The rotation of Izanagi Plate’s subduction from NW to NE resulted into the reactivation of NW and NE-trending thrust faults as transpressional or extensional ones. It was during this period that Late Cretaceous intrusions such as the Baoshan porphyritic monzogranite were emplaced in the terrane near the NW-trending faults and other intrusions at the edges of basins such as Yangchun, Luoding and Bobai basins near NE-trending faults.
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Published on Aug 1, 2017in Ore Geology Reviews 3.99
Wei Zheng3
Estimated H-index: 3
,
Jingwen Mao33
Estimated H-index: 33
+ 3 AuthorsXiaofei Yu2
Estimated H-index: 2
(Ministry of Land and Resources of the People's Republic of China)
Abstract The Xishan deposit, located in the western Guangdong Province in South China, is a quartz-vein type W-Sn deposit with an average Sn grade of 0.1–0.4 wt%. The deposit is temporally and spatially associated with Xishan alkali feldspar granite. The W–Sn mineralization is present mainly as veins that are hosted by the granite. In this paper we present new zircon U–Pb age, whole-rock geochemical data, Sr–Nd–Pb–Hf isotopic data and Re–Os age in order to constrain the nature and timing of magm...
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Published on Jun 1, 2017in Journal of Asian Earth Sciences 2.87
Xingzhou Jiang1
Estimated H-index: 1
(Guilin University of Technology),
Zhiqiang Kang2
Estimated H-index: 2
(CAS: Chinese Academy of Sciences)
+ 5 AuthorsSongquan Xiong1
Estimated H-index: 1
(Guilin University of Technology)
Abstract The Shedong W–Mo ore district in the south–central Dayaoshan Uplift of Guangxi, southern China hosts the Baoshan and Pingtoubei deposits, both of which occur in granodioritic plutons. Zircon U–Pb dating of granodiorites and its mafic microgranular enclaves (MMEs) in the Baoshan deposit yielded ages of 439.8 ± 3.2 and 441.1 ± 2.2 Ma, respectively. Granodiorites have moderate SiO 2 (54.5–63.0 wt.%) and high Al 2 O 3 (15.4–17.8 wt.%) contents, wide variations in major element ratios, signi...
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Published on Mar 1, 2017in Lithos 3.86
Wei Zheng1
Estimated H-index: 1
(Ministry of Land and Resources of the People's Republic of China),
Jingwen Mao1
Estimated H-index: 1
(Ministry of Land and Resources of the People's Republic of China)
+ 2 AuthorsXiaofei Yu2
Estimated H-index: 2
(Ministry of Land and Resources of the People's Republic of China)
Major and trace elements, whole rock Sr–Nd–Pb isotopes, LA–ICP–MS U–Pb zircon dating, zircon trace elements and Hf isotope data are reported for a suite of A-type granites from Yingwuling pluton in western Guangdong province, South China. Zircon U–Pb ages obtained by laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) show that biotite granite and alkali feldspar granite were emplaced in 81.3 ± 0.6 Ma and 80.6 ± 0.5 Ma, respectively. Both of the two suites have the petrograph...
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Published on Jan 1, 2016in Resource Geology 1.26
Wei Zheng3
Estimated H-index: 3
(China University of Geosciences),
Jingwen Mao33
Estimated H-index: 33
+ 2 AuthorsXiao-Yu Wang1
Estimated H-index: 1
(China University of Geosciences)
The Yinyan Sn deposit, one of the three typical porphyry Sn deposits in China, is located in the western Guangdong province of the Cathaysia Block. Rhenium and osmium isotopes of molybdenites from the Yinyan deposit were first used to constrain the age of mineralization. Rhenium concentrations in molybdenite samples range from 0.13 to 1.3 µg g−1, indicating a crustal source for the ore-forming materials. The Re–Os dating yield model ages ranging from 78.1 to 79.52 Ma, with an average of 78.65 ± ...
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Published on Jun 1, 2015in Ore Geology Reviews 3.99
Wei Zheng3
Estimated H-index: 3
(China University of Geosciences),
Jingwen Mao33
Estimated H-index: 33
+ 4 AuthorsYongjian Wang1
Estimated H-index: 1
Abstract Shilu is a large porphyry–skarn deposit in the Yunkai district in Guangdong Province, South China. The Shilu granitic intrusion in the mine area is a granodiorite which is genetically related to Cu mineralization. Plagioclase in the granodiorite has a zoned texture and is mainly andesine with minor amounts of labradorite, whereas the K-feldspars exhibit Carlsbad twins and some are also characterized by a zonal texture. K-feldspars from the granodiorite show high contents of Or (87–92 wt...
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Published on Jan 1, 2015in Geological Review
Wang Xiny1
Estimated H-index: 1
The Changpo—Tongkeng Tin—Polymetallic Deposits is located on the west deposits belt of Dachang Tin—Polymetallic Orefield in Guangxi Province. The layered orebodies have a wide spread. However,there are some major debates on their origin due to the lack of direct studies on their metalogenic ages. Data from U-Pb LAMC-ICP-MS analysis of three cassiterites from layered Orebody #92 show that the n(238U) / n(207Pb) — n(206Pb) /n(207Pb) isochronage of 95. 8 ± 2. 6 Ma( MSWD = 6. 3),is consistent with t...
2 Citations
Jiang Xing-zho1
Estimated H-index: 1
(CAS: Chinese Academy of Sciences)
The Baoshan copper deposit is located at the uplift in southern Dayaoshan uplift area,Guangxi. The mineralization is closely related to the Late Yanshanian quartz porphyry. Using LA-( MC)-ICP-MS zircon U- Pb dating,zircons from the granite porphyry has a weighted mean age of 94. 8 ± 0. 6 Ma( MSWD = 0. 17),zircons from the Cu-mineralization quartz porphyry has a weighted mean age of 93. 9 ± 0. 4 Ma( MSWD = 2. 5). These data suggest that the granite stock formed during the Late Cretaceous. Since t...
2 Citations
Published on Mar 1, 2014in Lithos 3.86
Long Chen2
Estimated H-index: 2
(USTC: University of Science and Technology of China),
Zi-Fu Zhao39
Estimated H-index: 39
(USTC: University of Science and Technology of China),
Yong-Fei Zheng72
Estimated H-index: 72
(USTC: University of Science and Technology of China)
Abstract A combined study of whole-rock major-trace elements and Sr–Nd–Pb–Hf isotopes as well as zircon U–Pb ages and Hf–O isotopes was carried out for Mesozoic andesitic–basaltic volcanics from the Luzong basin in the Middle–Lower Yangtze River Belt, South China. The results provide insights into the origin of mantle sources above fossil Andes-type oceanic subduction zone and thus into the petrogenesis of andesitic rocks on fossil and modern continental margins. These volcanics are primarily co...
51 Citations Source Cite
Published on Jan 1, 2014in Acta Petrologica Sinica 1.24
Wang Xiao1
Estimated H-index: 1
The Dulong Sn-Zn polymetallic deposit,Yunnan Province,is one of the largest cassiterite-sulfide deposits in China.Being lack of the accurate and reliable geochronological data,the genesis of this deposit is controversial greatly,so that it is very serious to restrict the further development of the geological prospecting. This paper has reported the U-Pb isotope dating of cassiterite by the method of in-situ LA-MC-ICP-MS from the Manjiazhai section of the Dulong ore-field. The result showed that ...
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Published on Jan 1, 2014in Journal of Asian Earth Sciences 2.87
Jingwen Mao33
Estimated H-index: 33
,
Franco Pirajno48
Estimated H-index: 48
(UWA: University of Western Australia)
+ 2 AuthorsAnita Berzina1
Estimated H-index: 1
In the Eurasian continent there are three huge metallogenic belts of Cu and Mo porphyry deposits, comprising the Paleozoic Central Asian Ore Belt in the north, the Tethyan Eurasian Ore Belt of Jurassic to Cenozoic age in the southwest, and the East Margin Ore Belt of the Eurasian Continent of Jurassic to Cretaceous age in the east. The latter is considered to be part of the vast Circum-Pacific ore belt. Some of the main features of the spatial–temporal distribution of Cu and Mo porphyry systems ...
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