LA-ICP-MS zircon U-Pb geochronology from Nansu large Rapakivi granite in the Jiaobei uplift belt shows the concordant age is 116.5±0.32Ma and the weighted average age is 116.7±0.89Ma, belonging to the late Yanshanian products of Early Cretaceous. The rock geochemical characteristics show that the SiO2 content of rapakivi granite ranges from 70.30% to 71.65%, with an average of 70.975%, A / CNK is 0.871 ~ 0.895 (average 0.883). K2O content is 4.70 ~ 5.75%, with an average of 5.14%, which is characterized by high potassium. Regarding trace elemental patterns, all the studied samples are enriched in large一ion-lithophile elements, e.g., K and Rb, and depleted in high-field-strength elements, e.g., Nb, Ta, and Ti. In terms of the chondrite-normalized rare earth element patterns, the Nansu samples are characterized by the strong enrichment of light rare earth elements (LREE) compared with heavy rare earth elements (HREE) and the absence of negative Eu anomalies. The Nansu ring porphyry granite is of high Sr and low Yb type, belonging to type I adakite, and formed in a high-pressure medium high-temperature environment of about 23km at depth and about 670oC. It is speculated that it was formed in the island arc environment and is related to the subduction of the Mesozoic Pacific plate.
Zhang L, Weinberg RF, Yang L-Q, Groves DI, Sai S-X, Matchan E, et al. Mesozoic Orogenic Gold Mineralization in the Jiaodong Peninsula, China: A Focused Event at 120 ± 2 Ma During Cooling of Pregold Granite Intrusions. Economic Geology 2020; 115(2): 415-441. https://doi.org/10.5382/econgeo.4716
Li X-C, Fan H-R, Santosh M, Hu F-F, Yang K-F, Lan T-G. Hydrothermal alteration associated with Mesozoic granite-hosted gold mineralization at the Sanshandao deposit, Jiaodong Gold Province, China[J]. Ore Geology Reviews, 2013; 53. https://doi.org/10.1016/j.oregeorev.2013.01.020
Fan HR, Zhai MG, Xie YH, Yang JH. Ore-forming fluids associated with granite-hosted gold mineralization at the Sanshandao deposit, Jiaodong gold province, China[J]. Mineralium Deposita, 2003; 38(6). https://doi.org/10.1007/s00126-003-0368-x
Yang L-Q, Deng J, Goldfarb RJ, Zhang J, Gao B-F, Wang Z-L. 40 Ar/ 39 Ar geochronological constraints on the formation of the Dayingezhuang gold deposit: New implications for timing and duration of hydrothermal activity in the Jiaodong gold province, China[J]. Gondwana Research, 2014; 25(4). https://doi.org/10.1016/j.gr.2013.07.001
Guangyuan C, Daisheng S, Shao YueGenetic mineralogy of accessory minerals of Kunyushan monzogranite in Jiaodong [J]Modern Geology, 1996; (02): 175-186.
Willow. Study on the relationship between magmatic rocks and gold mineralization in jinyiling gold deposit, Zhaoyuan, Shandong [D]Central South University, 2014.
Hong X. Zircon characteristics of Early Cretaceous granites in Jiaodong area and their constraints on gold mineralization [D]Chinese Academy of Geological Sciences, 2020.
Yumin C, Qingdong Z, Zhifu S, Zhaokun W, Hongrui F, Fengli X, et al. Study on geochemical background of gold in Jiaodong [J]Gold science and technology, 2019; 27(06): 791-801.
Yiduo Z, Junwei W, Zhaojun H, Jingjun Z. Geological characteristics and genetic analysis of Menlou mining area and peripheral gold deposits in Penglai City, Shandong Province [J]World nonferrous metals, 2016; (24): 50-51.
Fancong M, Daisheng S, Shengrong L. Characteristics and mineralization of Cishan granite in Jiaodong [J]Deposit geology, 2001; (04): 394-401.
Deming X, Jianming F, Xiqing C, Shunbo C, Liyan M, Kun Z, et al. Formation age, genesis and geological significance of dupanling rapakivi granite [J]Geotectonics and metallogeny, 2017; 41(03): 561-576.
Baohang M. Genesis and tectonic significance of kangbaolujiaying giant porphyry granite in northern Hebei [D]Chengdu University of technology, 2016.
Zheng Z. Characteristics and genesis of Qinling rapakivi granite [J]Knowledge window (Teacher Edition), 2017; (02): 32-33.
Yizhen B. Magmatic crystallization genetic characteristics of K-feldspar giant phenocrysts in DAZHUANGKE granite body, Beijing [J]Journal of Hebei University of Geosciences, 1986; (02): 123-133.
Haapala I, Rämö OT. Tectonic setting and origin of the Proterozoic rapakivi granites of southeastern Fennoscandia[J]. Transactions of the Royal Society of Edinburgh: Earth Sciences, 1992; 83(1-2). https://doi.org/10.1017/S0263593300007859
Scandolara JE, Fuck RA, Dall'Agnol R, Dantas EL. Geochemistry and origin of the early Mesoproterozoic mangerite-charnockite-rapakivi granite association of the Serra da Providência suite and associated gabbros, central-eastern Rondônia, SW Amazonian Craton, Brazil[J]. Journal of South American Earth Sciences, 2013; 45. https://doi.org/10.1016/j.jsames.2013.03.003
NengGao H, Xiaoxia W, Yangui S, Wenhuan S, Huanhuan C, Yunjie C. Geochemical characteristics, genesis and geological significance of Proterozoic Yingfeng Rapakivi Granite and its associated rocks in the northern margin of Qaidam [J]Geological review, 2007; (04): 460-472.
Biao S. Isotopic geochronology, REE geochemical characteristics and genesis of Miyun rapakivi granite [a]Collected works of Institute of geology, Chinese Academy of Geological Sciences (25) [C]:Chinese Geological Society, 1993; 21.
Liyakovicd VV. Rapakivi garite: problem of genesis and ore content.Geological Series 1991; (8): 51-65.
Kovadi VB. Problem of anorthosite and rapakivi granite formations. Geological Joumal, 1989; (2): 48-54.
Pavbovskiy EV. Problem of anorthosite and rapakivi garite, 1989; (5): 3-18.
Xinxiang L, You D, Qiuling C, et al. Qinling Indosinian Shahewan Ordovician rapakivi granite and its dynamic significanceChinese science, Series D, 1996; 26(3): 244-248.
Jianhua Y. Geochemical geology of the rapakivi granite suite in the Proterozoic rift trough in and around Beijing, 1990; 64(4): 322-336.
Biao S. Isotopic geochronology, REE geochemistry and genesis of Miyun rapakivi graniteSee: Journal of Institute of geology, Chinese Academy of Geological Sciences (25 volumes), Beijing: Geological Publishing House, 1992; 137-156.
Xuyang Z. Structural survey of Mesozoic granite and geological characteristics of typical gold deposits in Jiaodong [D]Chang'an University, 2018.
Jianbo Z, Yongfei Z, Zifu Z. Zircon U-Pb age of Mesozoic Magmatic Rocks in Wulian, Shandong [J]Journal of geology of colleges and universities, 2003; (02): 185-194.
Xiaoming L, Shan G, The fifth spring Rong, Yuan Honglin, Hu zhaochu20% of Single ZirconμSimultaneous determination of la-icp-msu-pb age and trace elements in the in situ micro region of M small spot bundle [J]Science Bulletin, 2007; (02): 228-235.
Juan Z. Geochemical study of Mesozoic Magmatic Rocks in Sulu orogenic belt [D]. Hefei: University of science and technology of China, 2011.
Boynton WV. Cosmochemistry of the Rare Earth Elements: Meteorite Studies[M]. one thousand nine hundred and eighty-four.
Weaberbl. The origin of ocean island endember composistions:Traceelement and isotopic constrains [J].Earth And Planetary Science Letters, 1991; 104(2): 381-397. https://doi.org/10.1016/0012-821X(91)90217-6
Geological Society, London, Special Publications 1989; 42: p. 313-345. https://doi.org/10.1144/GSL.SP.1989.042.01.19
Watson EB, Wark DA, Thomas JB. Crystallization thermometers for zircon and rutile[J]. Contributions to Mineralogy & Petrology, 2006; 151(4): 413. https://doi.org/10.1007/s00410-006-0068-5
Ferry JM, Watson EB. New thermodynamic models and revised calibrations for the Ti-in-zircon and Zr-in-rutile thermometers[J]. Contribut Mineral Petrol. 2007. https://doi.org/10.1007/s00410-007-0201-0
Watson EB, Harrison TM, Watson EB, Harrison TM. Zircon saturation revisited: temperature and composition effects in a variety of crustal magma types. Earth Planet Sci Lett. 64, 295-304[J]. Earth and Planetary Science Letters, 1983; 64(2): 295-304. https://doi.org/10.1016/0012-821X(83)90211-X
Xiaoyue G, Xianhua L, Zhigang C, Wuping L. Geochemical characteristics and genesis of Yanshanian high SR low Y-type intermediate acid igneous rocks in eastern China: constraints on crustal thickness in eastern China [J]Science Bulletin, 2002; (06): 474-480.
Collins WJ, Beams SD, White AJR, Chappell BW. Nature and origin of A-type granites with particular reference to southeastern Australia[J]. Contributions to Mineralogy and Petrology,1982; 80(2). https://doi.org/10.1007/BF00374895
Fitton JG, James D, Leeman WP. Basic magmatism associated with Late Cenozoic extension in the western United States: Compositional variations in space and time[J]. John Wiley & Sons, Ltd, 1991; 96(B8). https://doi.org/10.1029/91JB00372
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