Diorite enclaves and host granite of the early Miocene Gorontalo pluton in the North Sulawesi Arc, Indonesia: Implications for recycled oceanic crust and crust-mantle interaction

被引：3

作者：

Gan, Chengshi ^{[1
,2
]}

Wang, Yuejun ^{[1
,2
]}

Qian, Xin ^{[1
,2
,4
]}

Lu, Xianghong ^{[1
]}

Mustapha, Khairul Azlan ^{[1
,3
]}

Zhang, Yuzhi ^{[2
]}

Wu, Sainan ^{[1
]}

机构：

[1] Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou 510275, Peoples R China

[2] Southern Marine Sci & Engn Guangdong Lab, Zhuhai 519082, Peoples R China

[3] Univ Malaya, Fac Sci, Dept Geol, Kuala Lumpur 50603, Malaysia

[4] Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, 135 Xingang Xi Rd, Guangzhou 510275, Peoples R China

来源：

JOURNAL OF ASIAN EARTH SCIENCES | 2022年 / 227卷

基金：

中国国家自然科学基金;

关键词：

Host granites; Diorite enclaves; Gorontalo pluton; Recycled oceanic crust; Crust-mantle interaction; North Sulawesi Arc; MAFIC MICROGRANULAR ENCLAVES; OXYGEN-ISOTOPE VARIATIONS; SIERRA-NEVADA BATHOLITH; A-TYPE GRANITOIDS; CONTINENTAL-CRUST; U-PB; METAMORPHIC COMPLEX; MAGMATIC ENCLAVES; TRACE-ELEMENTS; SE ASIA;

D O I：

10.1016/j.jseaes.2022.105101

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Zircon Hf-O isotopes, combined with whole-rock Sr-Nd-Pb isotopes, can provide unambiguous evidence for crustal recycling and crust-mantle interaction processes. The North Sulawesi Arc (Indonesian) was traditionally regarded as an intra-oceanic arc, and the diorite enclaves and host granites of the Gorontalo pluton provide excellent opportunities for evaluating these issues, based on our zircon U-Pb geochronological and Hf-O isotopic, and whole-rock geochemical analyses. This study firstly reports the zircon U-Pb ages of -20.1-22.4 Ma for the host granites and-19.5-20.4 Ma for the diorite enclaves. The host granites have high SiO2, and low 10000*Ga/ Al, A/CNK and Rb/Sr, classified as unfractionated I-type granites. They are characterized by high epsilon Nd-(t) (from +4.8 to +5.7), high zircon epsilon Nd-(t) (from +11.1 to +16.4), sub-normal mantle zircon delta O-18 (4.6-5.4 parts per thousand), moderate (Pb-206/Pb-204)i (18.29-18.45), and young two-stage Hf model ages (52-394 Ma), deriving from partial melting of a juvenile mafic crust. The diorite enclaves show typical magmatic textures and contain abundant acicular apatite and plagioclase megacrysts with an obvious rim-core texture. They also have high epsilon Nd-(t)& nbsp;(from +4.8 to +5.1), high zircon epsilon Nd-(t)(from +10.7 to +15.2), sub-normal mantle zircon delta O-18 (4.1-5.1 parts per thousand) and moderate (Pb-206/Pb-204)i (18.3), interpreted as the products of mixing of magmas derived from a depleted mantle and a juvenile crust. The diorite enclaves have sub-normal mantle delta O-18 values, positive epsilon Nd-(t) and zircon epsilon Nd-(t), suggesting recycled altered oceanic crust into depleted mantle prior to magma generation. The presence of the host granites and diorite enclaves provides robust evidence for early Miocene (or prior to early Miocene) crust-mantle interaction in the North Sulawesi Arc.

引用

页数：13

共 122 条

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