The adakite connection of the Tuwu-Yandong copper porphyry belt, eastern Tianshan, NW China: trace element and Sr-Nd-Pb isotope geochemistry

被引：143

作者：

Zhang, Lianchang ^{[1
]}

Xiao, Wenjiao ^{[1
]}

Qin, Kezhang ^{[1
]}

Zhang, Qi ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China

来源：

MINERALIUM DEPOSITA | 2006年 / 41卷 / 02期

关键词：

adakite; porphyry copper deposit; island arc; late Paleozoic; east Tianshan;

D O I：

10.1007/s00126-006-0058-6

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The Tuwu-Yandong porphyry copper belt lies in the eastern Tianshan mountains, eastern section of the Central Asian orogenic belt. The copper mineralization is mainly hosted in plagiogranite porphyries intruded into early Carboniferous volcanic rocks of the Paleozoic Dananhu island arc between the Tarim and Siberian plates. The plagiogranite porphyries have contents of 65-73 wt% SiO2, 14-17 wt% Al2O3, 0.9-2.2 wt% MgO, 3-16 ppm Y, 0.4-1.40 ppm Yb, 347-920 ppm Sr, and positive Eu anomalies. The rocks also exhibit positive epsilon(Nd(t)) values (+5.0 to +9.4) and low initial Sr-87/Sr-86 values (0.70316-0.70378). Such features are similar to those of adakites derived from partial melting of a subduction-related oceanic slab. The mineralization age is early Carboniferous (350-320 Ma), which is close to that of the porphyries. The close relationship between the Cu mineralization and the porphyry is also indicated by their similar Sr-Nd-Pb isotopic compositions. We suggest that the copper porphyry (magma) system in the Dananhu island arc was formed by direct melting of an obliquely subducting early Carboniferous oceanic slab.

引用

页码：188 / 200

页数：13

共 62 条

[31]

MCCALLOCH MT, 1982, EARTH PLANET SC LETT, V58, P51

[32]

Mungall JE, 2002, GEOLOGY, V30, P915, DOI 10.1130/0091-7613(2002)030<0915:RTMSMA>2.0.CO

[33]

[34] Giant versus small porphyry copper deposits of Cenozoic age in northern Chile:: adakitic versus normal calc-alkaline magmatism [J].

Oyarzun, R ;

Márquez, A ;

Lillo, J ;

López, I ;

Rivera, S .

MINERALIUM DEPOSITA, 2001, 36 (08) :794-798

[35] Oyu Tolgoi, Mongolia:: Siluro-Devonian porphyry Cu-Au-(Mo) and high-sulfidation Cu mineralization with a cretaceous chalcocite blanket [J].

Perelló, J ;

Cox, D ;

Garamjav, D ;

Sanjdorj, S ;

Diakov, S ;

Schissel, D ;

Munkhbat, TO ;

Oyun, G .

ECONOMIC GEOLOGY AND THE BULLETIN OF THE SOCIETY OF ECONOMIC GEOLOGISTS, 2001, 96 (06) :1407-1428

[36] Paleozoic epithermal Au and porphyry Cu deposits in North Xinjiang, China: Epochs, features, tectonic linkage and exploration significance [J].

Qin, KZ ;

Sun, S ;

Li, JL ;

Fang, TG ;

Wang, SL ;

Liu, W .

RESOURCE GEOLOGY, 2002, 52 (04) :291-300

[37]

Qin KZ, 2003, TECTONIC EVOLUTION M, P227

[38] Melt components derived from a subducted slab in late orogenic ore-bearing porphyries in the Gangdese copper belt, southern Tibetan plateau [J].

Qu, XM ;

Hou, ZQ ;

Li, YG .

LITHOS, 2004, 74 (3-4) :131-148

[39] Reaction between slab-derived melts and peridotite in the mantle wedge: experimental constraints at 3.8 GPa [J].

Rapp, RP ;

Shimizu, N ;

Norman, MD ;

Applegate, GS .

CHEMICAL GEOLOGY, 1999, 160 (04) :335-356

[40] Adakite-like signature of Late Miocene intrusions at the Los Pelambres giant porphyry copper deposit in the Andes of central Chile: metallogenic implications [J].

Reich, M ;

Parada, MA ;

Palacios, C ;

Dietrich, A ;

Schultz, F ;

Lehmann, B .

MINERALIUM DEPOSITA, 2003, 38 (07) :876-885

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