Late Paleoproterozoic sedimentary rock-hosted stratiform copper deposits in South China: their possible link to the supercontinent cycle

Zhao, Xin-Fu; Zhou, Mei‐Fu; Li, Jianwei; Qi, Liang

doi:10.1007/s00126-012-0445-0

Cited by 27 publications

(21 citation statements)

References 25 publications

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“…From the base upwards, the Lower Kunyang Group (Zhao et al 2010;Zhao & Zhou, 2011;Yin, Sun & Zhang, 2011) includes the Yinmin, Luoxue, E'touchang and Luzhijiang formations, whereas the Upper Kunyang Group consists of the Dayingpan, Heishantou, Dalongkou and Meidang formations. Several 'Dongchuan-type' Fe-Cu ore deposits are hosted in the Lower Kunyang Group (Zhao et al 2010(Zhao et al , 2013Zhao & Zhou, 2011). Detrital zircons from the Lower Kunyang Group yielded the youngest age of c. 1.78 Ga, and a tuff sample from the same group has a U-Pb zircon age of 1742 ± 13 Ma (Zhao et al 2010).…”

Section: Geological Background and Petrographymentioning

confidence: 99%

“…Numerous meta-volcanic-and meta-sedimentary-rockhosted Fe-Cu ore deposits were developed in the late Palaeoproterozoic to early Mesoproterozoic basins in the Kangdian region in the southwestern Yangtze Block, for example, the Dahongshan, Hekou, and Dongchuan Fe-Cu ore deposits (D. F. He, unpub. Ph.D. thesis, Graduate School of the Chinese Academy of Sciences, 2009;Zhao et al 2010Zhao et al , 2013Zhao & Zhou, 2011;Chen & Zhou, 2012). The ages of the metavolcanic rocks and mafic intrusions from the upper Palaeoproterozoic to lower Mesoproterozoic strata in the Kangdian region had recently been well constrained by the availability of precise U-Pb zircon ages (Greentree & Li, 2008;D.…”

Section: B Tectonic Implicationsmentioning

confidence: 99%

“…F. He, unpub. Ph.D. thesis, Graduate School of the Chinese Academy of Sciences, 2009;Zhao et al 2010Zhao et al , 2013Zhao & Zhou, 2011;Chen, Zhou & Zhao, 2013). However, such meta-volcanic rocks and mafic intrusions (Greentree & Li, 2008; D. F. He, unpub.…”

Section: B Tectonic Implicationsmentioning

confidence: 99%

“…In recent years, many intrusive igneous rocks in the southwestern Yangtze Block have been gradually identified in age as late Palaeoproterozoic to early Mesoproterozoic, although these intrusive igneous rocks in the Kangdian region are sparse and on a small scale. For example, a number of mafic intrusions and dykes intruded into the Dahongshan Group, Lower Kunyang Group (also called the Dongchuan Group; we will use the name Lower Kunyang Group in the remainder of the paper), Hekou Group and Huili Group in the Kangdian region (Zhao et al 2010(Zhao et al , 2013Guan et al 2011;Zhao & Zhou, 2011;Fan et al 2013). A dolerite dyke cutting the Dahongshan Group has a laser ablation inductively couple plasma mass spectrometry (LA-ICP-MS) U-Pb zircon age of 1659 ± 16 Ma (Zhao & Zhou, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…A dolerite dyke cutting the Dahongshan Group has a laser ablation inductively couple plasma mass spectrometry (LA-ICP-MS) U-Pb zircon age of 1659 ± 16 Ma (Zhao & Zhou, 2011). The other dolerite dykes that cut the Yinmin Formation of the Lower Kunyang Group have LA-ICP-MS and a secondary ion mass spectroscopy (SIMS) U-Pb zircon ages of 1690 ± 32 Ma (Zhao et al 2010) and 1701 ± 28 Ma (Zhao et al 2013), respectively.…”

Section: Introductionmentioning

confidence: 99%

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The origin of thec. 1.7 Ga gabbroic intrusion in the Hekou area, SW China: constraints from SIMS U–Pb zircon geochronology and elemental and Nd isotopic geochemistry

et al. 2016

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The late Palaeoproterozoic to early Mesoproterozoic igneous rocks of southwestern China are characterized by a number of mafic intrusions and dykes. However, the origin and tectonic implications of these mafic intrusions and dykes remain unclear. The Hekou mafic intrusion, intruding into the Hekou Group in the Hekou area, SW China, is the biggest and most representative one. The intrusion is mainly composed of coarse-grained in the central zone (CZ) and medium- to fine-grained gabbroic rocks in the outer zone (OZ). Cameca secondary ion mass spectroscopy (SIMS) U–Pb zircon ages, and geochemical and Nd isotopic results for the intrusion are reported in this paper. SIMS U–Pb zircon ages indicate that the gabbroic rocks from the CZ and OZ were emplaced at 1735±6.5 Ma and 1736±4.0 Ma, respectively. This suggests that the Hekou intrusion originated from c. 1.7 Ga mafic magmatism in the southwestern Yangtze Block. The coarse-grained rocks in the CZ of the intrusion show fairly homogeneous major- and trace-element compositions. In contrast, the medium- to fine-grained rocks from the OZ display slightly evolved compositions, with relatively lower Mg nos, MgO, Al2O3, Cr and Ni contents, and higher SiO2, CaO and Zr concentrations than those of the rocks from the CZ. Although the gabbroic rocks of the intrusion have low total rare earth element (REE) contents (REE = 29.3–40.2 ppm) with slightly light REE (LREE)-enriched and heavy REE (HREE)-depleted patterns, they exhibit distinct trace-element and Nd isotopic features. The rocks from the CZ are characterized by slightly LREE-enriched and ‘convex upwards’ incompatible trace-element patterns with significant Th depletion and insignificant Nb and Ta depletion relative to La. However, the rocks from the OZ have relatively flatter REE patterns than those of the rocks from the CZ. In addition, the rocks from the OZ are slightly enriched in Th and depleted in Nb and Ta relative to La. The εNd(T) values of the CZ and the OZ rocks are +0.70 to +2.3 and −0.30 to +0.24, respectively. The parental magma for the Hekou gabbroic intrusion exhibits affinity with a subalkaline basaltic magma, which was possibly generated by relatively high degrees of partial melting of a slightly depleted asthenospheric mantle source. Their geochemical and isotopic variations were due to slight crystal fractionation with varying degrees of crustal contamination. The Hekou intrusion was therefore supposed to form in an anorogenic extensional environment. It is further suggested that c. 1.7 Ga is an important onset timing of widespread anorogenic magmatism in the southwestern Yangtze Block. We interpret the late Palaeoproterozoic gabbroic intrusion to represent anorogenic mafic magmatism, which was most likely related to the break-up of the Columbia supercontinent.

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