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Geochemical, geochronological and isotopic studies of the Taishanmiao batholith and the Zhuyuangou Mo deposit it hosted, Qinling, China

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dc.contributor.authorYu, J.
dc.contributor.authorLi, N.
dc.contributor.authorQi, N.
dc.contributor.authorXu, C.
dc.contributor.authorHuang, P.C.
dc.contributor.authorHand, M.
dc.contributor.authorMorrissey, L.J.
dc.contributor.authorPayne, J.L.
dc.contributor.authorChen, Y.J.
dc.date.issued2022
dc.description.abstractThe Qinling Orogen is well known for its huge Mo resource. The porphyry Mo deposits are associated with small granite porphyries, albeit great batholiths accommodate limited Mo mineralization. In this study, detailed geochemical, isotopic, and geochronological studies were carried out to constrain the petrogenesis of the Taishanmiao batholith and time framework of magmatism and associated Mo mineralization at Zhuyuangou. Zircon geochronology reveals gradually decreasing emplacement ages, from 124.8 ± 1.0 Ma for the medium- to coarse-grained syenogranite, through 122.8 ± 1.4 Ma for fine- to medium-grained syenogranite, to 115.1 ± 0.95 Ma for porphyritic syenogranite. The last two phases hosted the Zhuyuangou Mo mineralization with a molybdenite Re-Os isochron age of 117.7 ± 1.0 Ma. Major and trace element features support highly fractionated I-type affinity for Taishanmiao. Zircon Lu-Hf isotopic studies yield εHf(t) values of −19.6 − -8, and two-stage Hf model ages (TDM2) of 1679–2408 Ma. It thus supports ancient continental crust, especially Taihua Supergroup and Xiong'er Group, as the primary source. Compared to the source rock, the low Mo concentrations of the batholith are attributed to the massive fluid flux that contributes to the formation of the Zhuyuangou and Donggou deposits. Small porphyries can effectively concentrate exsolved fluids and metal compared with great batholith. Their shallow emplacement depths result in greater temperature/pressure/composition gradient with the wall rocks, higher cooling rate, more fractures or even breccia, and fluid boiling and mixing, facilitating intensive hydrothermal alteration and mineralization.
dc.identifier.citationOre Geology Reviews, 2022; 142(104711):1-18
dc.identifier.doi10.1016/j.oregeorev.2022.104711
dc.identifier.issn0169-1368
dc.identifier.issn1872-7360
dc.identifier.orcidHand, M. [0000-0003-3743-9706]
dc.identifier.orcidMorrissey, L.J. [0000-0001-7506-6117]
dc.identifier.urihttps://hdl.handle.net/11541.2/27233
dc.language.isoen
dc.publisherElsevier BV
dc.relation.fundingNational Science Foundation of China 41630313
dc.relation.fundingNational Science Foundation of China 42122014
dc.relation.fundingChina Scholarship Council
dc.relation.fundingXinjiang Outstanding Youth Scientific Grant 2020Q006
dc.rightsCopyright 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license. (http://creativecommons.org/licenses/by-nc-nd/4.0/)
dc.source.urihttps://doi.org/10.1016/j.oregeorev.2022.104711
dc.subjectgeochronology
dc.subjectgeochemistry
dc.subjectTaishanmiao
dc.subjectZhuyuangou
dc.subjectQinling
dc.titleGeochemical, geochronological and isotopic studies of the Taishanmiao batholith and the Zhuyuangou Mo deposit it hosted, Qinling, China
dc.typeJournal article
pubs.publication-statusPublished
ror.fileinfo12239886060001831 13305606400001831 9916606250901831
ror.mmsid9916606250901831

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