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Apatite Texture, Composition, and O-Sr-Nd Isotope Signatures Record Magmatic and Hydrothermal Fluid Characteristics at the Black Mountain Porphyry Deposit, Philippines

文献类型：期刊论文

作者Cao, Ming Jian2,3; Evans, Noreen J.1; Hollings, Pete4; Cooke, David R.5,6; McInnes, Brent I. A.1; Qin, KeZhang2,3,7
刊名ECONOMIC GEOLOGY
出版日期2021-08-01
卷号116期号:5页码:1189-1207
ISSN号0361-0128
DOI10.5382/econgeo.4827
英文摘要The trace elemental and isotopic signatures in apatite can be modified during hydrothermal alteration. This study investigates the suitability of apatite as an indicator of the source, chemistry, and evolution of magma and hydrothermal fluids. In situ textural, elemental, and O-Sr-Nd isotope analyses were performed on apatite in thin sections, from fresh and propylitically altered pre- and synmineralized dioritic porphyries from the Black Mountain porphyry Cu deposit in the Philippines. All studied apatite crystals have similar subhedral to euhedral shapes and are homogeneous in the grayscale in backscattered electron images. In cathodoluminescence images, the apatite in fresh and altered rocks displays yellow to yellow-green and green to brown luminescence, respectively. Apatite in fresh rocks has a higher Cl and Mn content, and lower Fe, Mg, Sr, Pb, and calculated XOH-apatite, compared to apatite in altered rocks. The content of F, rare earth elements (REEs), Y, U, Th, and Zr, and the Sr-Nd isotope signatures of apatite from fresh and altered rocks are similar in all apatite grains (Sr-87/Sr-86 = 0.7034-0.7042 vs. 0.7032-0.7043, epsilon(Nd)(t) = 5.3-8.0 vs. 5.1-8.4). The X-ray maps and elemental and oxygen isotope signatures across individual apatite crystals are typically homogeneous in apatite from both fresh and altered rocks. The distinct luminescence colors, coupled with distinct mobile element compositions (Cl, OH, Mn, Mg, Fe, Sr, Pb), indicate modification of primary magmatic apatite during interaction with hydrothermal fluids. The similarities in Sr isotope ratios (Sr-87/Sr-86 = 0.7032-0.7043) but slight differences in O isotope signatures (delta O-18 = 6.0 +/- 0.3% vs. 6.6 +/- 0.3%) in apatite from fresh and altered rocks are consistent with the magma and hydrothermal fluids having the same source and suggest significant phase separation in the hydrothermal fluids given that O-18 preferentially fractionates into the residual liquid relative to O-16 during phase separation. The similarity of immobile element (REE, Y, U, Th, and Zr) contents in both populations of apatite, consistency of textures and Nd isotope compositions, and absence of obvious dissolution-reprecipitation features all suggest that altered apatite retains some magmatic characteristics. The apatite in fresh rocks has oxygen isotope compositions similar to that of zircons from the same sample (delta O-18 = 5.9 +/- 0.3%), indicating little to no oxygen isotope fractionation between zircon and apatite and that apatite can be a good proxy for the oxygen isotope composition of the magma. Based on the Cl contents of the magmatic and replacement apatite, and assuming their equilibrium with high-temperature magma fluid and replacement hydrothermal fluid, respectively, the calculated Cl content of the early magmatic fluid and the later replacement fluid can be estimated to be 6.4 to 15.1 wt % and similar to 0.25 +/- 0.03 wt %, respectively. This indicates a depletion of Cl from the early high-temperature fluid to the replacement fluid, consistent with phase separation. This study demonstrates that cathodoluminescence, elemental compositions (such as Cl, Mn, Mg, Fe, Sr, Pb) and Sr-O isotope signatures in apatite can be modified during hydrothermal alteration, whereas other components (REE, Y, U, Th, and Zr) and the Nd isotope composition are preserved. These features can be used to constrain the origin, chemistry, and evolution of the primary magma and ore-forming hydrothermal fluids.
WOS关键词TRACE-ELEMENT COMPOSITIONS ; CHINA CRATON IMPLICATIONS ; SILICATE MELT INCLUSIONS ; CU-MO DEPOSIT ; BAGUIO DISTRICT ; WESTERN JUNGGAR ; OXIDATION-STATE ; COPPER-DEPOSITS ; SULFUR-RICH ; AU DEPOSIT
资助项目Australian Mineral Industry Research Association[P765] ; Australian Mineral Industry Research Association[P765a] ; Anglo American (Philippines) ; National Key Research and Development Plan[2017YFC0601306] ; National Natural Sciences Foundation of China[41672090] ; Youth Innovation Promotion Association CAS[2018086] ; Science and Industry Endowment Fund (SIEF)[RI13-01] ; Natural Sciences and Engineering Research Council Discovery grant
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者SOC ECONOMIC GEOLOGISTS, INC
WOS记录号WOS:000656493900007
资助机构Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Anglo American (Philippines) ; Anglo American (Philippines) ; Anglo American (Philippines) ; Anglo American (Philippines) ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Anglo American (Philippines) ; Anglo American (Philippines) ; Anglo American (Philippines) ; Anglo American (Philippines) ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Anglo American (Philippines) ; Anglo American (Philippines) ; Anglo American (Philippines) ; Anglo American (Philippines) ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Australian Mineral Industry Research Association ; Anglo American (Philippines) ; Anglo American (Philippines) ; Anglo American (Philippines) ; Anglo American (Philippines) ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Science and Industry Endowment Fund (SIEF) ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant ; Natural Sciences and Engineering Research Council Discovery grant
源URL[http://ir.iggcas.ac.cn/handle/132A11/102041]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Cao, Ming Jian
作者单位1.Curtin Univ, Sch Earth & Planetary Sci, John de Laeter Ctr, Perth, WA 6945, Australia
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
4.Lakehead Univ, Geol Dept, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada
5.Univ Tasmania, Australia Res Council Ind Transformat Res Hub, Transforming Min Value Chain, Hobart, Tas 7001, Australia
6.Univ Tasmania, Ctr Ore Deposit & Earth Sci CODES, Hobart, Tas 7001, Australia
7.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Cao, Ming Jian,Evans, Noreen J.,Hollings, Pete,et al. Apatite Texture, Composition, and O-Sr-Nd Isotope Signatures Record Magmatic and Hydrothermal Fluid Characteristics at the Black Mountain Porphyry Deposit, Philippines[J]. ECONOMIC GEOLOGY,2021,116(5):1189-1207.
APA Cao, Ming Jian,Evans, Noreen J.,Hollings, Pete,Cooke, David R.,McInnes, Brent I. A.,&Qin, KeZhang.(2021).Apatite Texture, Composition, and O-Sr-Nd Isotope Signatures Record Magmatic and Hydrothermal Fluid Characteristics at the Black Mountain Porphyry Deposit, Philippines.ECONOMIC GEOLOGY,116(5),1189-1207.
MLA Cao, Ming Jian,et al."Apatite Texture, Composition, and O-Sr-Nd Isotope Signatures Record Magmatic and Hydrothermal Fluid Characteristics at the Black Mountain Porphyry Deposit, Philippines".ECONOMIC GEOLOGY 116.5(2021):1189-1207.

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来源：地质与地球物理研究所

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