U-Pb and Re-Os geochronology and geochemistry of the Ulgen hidden porphyry Mo deposit in the Derbugan metallogenic belt (NE China): Insights into petrogenesis and tectonic setting
文献类型：期刊论文
| 作者 | Xia, Tianjiao1,2,5; Liang, Xinquan1,2; Wang, Ce3,4; Liang, Xirong1,2,5; Shan, Yehua1,2 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2024-03-01 |
| 卷号 | 136期号:3-4页码:1185-1204 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36697.1 |
| 英文摘要 | The Ulgen porphyry Mo deposit, recently discovered in the northeastern segment of the Derbugan metallogenic belt, NE China, is a large and hidden ore deposit. Investigation of this deposit provides insights into the geodynamic background and metallogenic mechanism of Mesozoic porphyry Mo deposits that are exposed elsewhere in NE China. The host rocks consist of muscovite monzonitic granite (MMG) and biotite granitic porphyry (BGP), which are intruded into Lower and/or Middle Jurassic intermediate-felsic volcanic-sedimentary rocks and pre-ore monzogranitic porphyry (MP). Zircon laser ablation-inductively coupled U-Pb age dating indicates that the MMG and BGP were emplaced at 144.9 Ma and 144.7 Ma, ca. 14 m.y. younger than the intrusion age of MP (159.3 Ma). Molybdenite Re-Os isotopic dating indicates that Mo mineralization occurred at 144.9 Ma, almost simultaneously with the 145 Ma magmatic activity. Geochemically, all of the Ulgen granitoids are enriched in large ion lithophile elements (e.g., Rb, Th, U, and K) and light rare earth elements, and are depleted in high field strength elements (e.g., Nb, Ta, and Ti). The pre-ore MPs belong to I-type granites with moderately negative Eu the syn-ore MMGs exhibit S-type affinity with pronounced negative Eu anomalies (Eu/Eu* = 0.29-0.39). The ore -forming BGPs display adakite-like geochemical features in terms of high -Sr, low -Y, and low-Yb contents, and slightly negative Eu anoma- lies (Eu/Eu* = 0.72-0.74). All intrusive rocks have relatively low initial (87Sr/86Sr)i ratios (0.7044-0.7055) and positive epsilon Nd(t) values (+1.15 to +2.65), positive epsilon Hf(t) val- ues (+4.0 to +9.4), young two -stage Nd and Hf model ages (tDM2(Nd) = 841-731 Ma, tDM2(Hf) = 943-604 Ma), and moderate (206Pb/204Pb)i (18.300-18.402), (207Pb/204Pb)i (15.557-15.564), and (208Pb/204Pb)i (38.180- 38.307) ratios. Therefore, it is most likely that these intrusive rocks originated from a mix- ture of two sources of magma derived from the mantle and juvenile lower crust, in which there were variable degrees of the fractional crystallization of ilmenite, apatite, and pla- gioclase. Rather than the partial melting of oceanic slabs, the fractional crystallization of hornblende and accessory minerals (e.g., il- menite and apatite) induces the adakitic geo- chemical signature of BGPs. Compared with the BGPs, the MPs had a relatively deeper magma source region, whereas the MMGs had a relatively shallower magma source region. The BGPs and the Mo-bearing fluids of the Ulgen deposit were most probably de- rived simultaneously from magma that was generated at an extensional setting following the closure of the Mongol -Okhotsk Ocean during the latest Jurassic. Enrichment of Mo by late -stage fractional crystallization most likely played an important role in concen- trating Mo during the formation of the Ul- gen hidden Mo deposit. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001187120100005 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77172]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Liang, Xirong |
| 作者单位 | 1.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 3.Guangdong Prov Key Lab Marine Resources & Coastal, Zhuhai 519082, Guangdong, Peoples R China 4.Sun Yat Sen Univ, Sch Marine Sci, Zhuhai 519082, Guangdong, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xia, Tianjiao,Liang, Xinquan,Wang, Ce,et al. U-Pb and Re-Os geochronology and geochemistry of the Ulgen hidden porphyry Mo deposit in the Derbugan metallogenic belt (NE China): Insights into petrogenesis and tectonic setting[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2024,136(3-4):1185-1204. |
| APA | Xia, Tianjiao,Liang, Xinquan,Wang, Ce,Liang, Xirong,&Shan, Yehua.(2024).U-Pb and Re-Os geochronology and geochemistry of the Ulgen hidden porphyry Mo deposit in the Derbugan metallogenic belt (NE China): Insights into petrogenesis and tectonic setting.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,136(3-4),1185-1204. |
| MLA | Xia, Tianjiao,et al."U-Pb and Re-Os geochronology and geochemistry of the Ulgen hidden porphyry Mo deposit in the Derbugan metallogenic belt (NE China): Insights into petrogenesis and tectonic setting".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 136.3-4(2024):1185-1204. |
入库方式： OAI收割
来源：广州地球化学研究所
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