| Chronology, geochemistry and Sr-Nd isotope studies of Jurassic intrusions in the Diyanqinamu porphyry Mo mine, central Inner Mongolia, China | |
| Hairui Sun; Zhilong Huang; Wenbo Li; Chengbiao Leng; Deyun Ma; Xingchun Zhang | |
| 2014 | |
| Source Publication | Journal of Asian Earth Sciences
 |
| Volume | 88Issue:1Pages:85-97 |
| Abstract | Available cores of porphyritic granite and aplitic granite from the Diyanqinamu porphyry Mo deposit in the north central Great Xing'an Range presented an opportunity to examine and analyze Mesozoic igneous rocks far from the Paleo-Pacific subduction zone. The Diyanqinamu granites are highly fractionated 1type, distinguished from the M-, A- or S-type granite by: high SiO2, and Rb; low Zr, Nb, Y, and Ce; low Fe2O(3)(total)/MgO and (K2O + Na2O)/CaO ratios; low alumina saturation index (<1.1); low initial I-Sr ratios (0.70137-0.70451); positive epsilon Nd(t) values (2.37-3.77); and negative correlation between P2O5 and SiO2. The aplitic granites were generated by fractional crystallization of the porphyritic granite, as evidenced by: spatial proximity; consistent zircon U-Pb ages (156 Ma) within error; correlations between other oxides and SiO2 in Haker diagrams; low Ba, Sr, Nb, P, Ti, Eu; linear relationship in both (La/Yb)(N) vs. La and Sr vs. Ba diagrams; and, decreasing LREE and Sigma REE with increasing SiO2. The Diyanqinamu granites have young depleted-mantle two-stage model ages (avg. T-DM2 = 660 Ma) similar to those of most Mesozoic voluminous felsic magmas in northeastern China, and were likely sourced from pre-existent crustal components both "old" and juvenile that had been juxtaposed during the tectonic evolution of the Paleo-Asian Ocean. These granites project in the transitional field from syn-collision to post-collision tectonic settings on tectonic discrimination diagrams, implying emplacement in an extensional environment. Extensional volcanism and basin formation in the Great Xing'an Range region in Late Jurassic is coeval with the Diyanqinamu granites, demonstrating that post-orogenic lithospheric extension related to the closure of the Mongol-Okhotsk Ocean was the main driving force for Late Jurassic magmatism in this region. |
| Keyword | Porphyry Mo Jurassic Granite Diyanqinamu Great Xing’an Range Mongol-okhotsk Orogenic Belt Central Asian Orogenic Belt |
| Subject Area | 矿床地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5223 |
| Collection | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 |
| Recommended Citation GB/T 7714 | Hairui Sun,Zhilong Huang,Wenbo Li,et al. Chronology, geochemistry and Sr-Nd isotope studies of Jurassic intrusions in the Diyanqinamu porphyry Mo mine, central Inner Mongolia, China[J]. Journal of Asian Earth Sciences,2014,88(1):85-97. |
| APA | Hairui Sun,Zhilong Huang,Wenbo Li,Chengbiao Leng,Deyun Ma,&Xingchun Zhang.(2014).Chronology, geochemistry and Sr-Nd isotope studies of Jurassic intrusions in the Diyanqinamu porphyry Mo mine, central Inner Mongolia, China.Journal of Asian Earth Sciences,88(1),85-97. |
| MLA | Hairui Sun,et al."Chronology, geochemistry and Sr-Nd isotope studies of Jurassic intrusions in the Diyanqinamu porphyry Mo mine, central Inner Mongolia, China".Journal of Asian Earth Sciences 88.1(2014):85-97. |
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