U–Pb zircon, geochemical and Sr–Nd–Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong–Baoshan Block, Western Yunnan Province, SW China

Liu, Shen; Hu, Ronggui; Gao, Shan; Chen, Feng; Huang, Zhilong; Lai, Shaocong; Yuan, Huan; Liu, Xiaoming; Coulson, Ian M.; Guo, Feng; Wang, Tao; Qi, YouQiang

doi:10.1016/j.jseaes.2009.05.004

Cited by 140 publications

(59 citation statements)

References 62 publications

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“…Such isotopic compositions are consistent with those of the Gangdese granites (Debon et al, 1986;Harris et al, 1988b;Wen et al, 2008a;Huang et al, 2010) and the Lachlan I-type granites (Healy et al, 2004), but distinct from those of the Northern magmatic belt, Tengchong and Baoshan terranes and the Lachlan S-type granites in eastern Australia (e.g., Healy et al, 2004;Liu et al, 2009;Yang et al, 2009). …”

Section: Geochemical Characteristicssupporting

confidence: 65%

Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths

Wang

et al. 2014

Gondwana Research

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Section: Geochemical Characteristicssupporting

confidence: 65%

Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths

Wang

et al. 2014

Gondwana Research

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“…This suggests that the Lincang granites might exhibit the Pb isotope composition of orogenic granites, the Shuangmaidi two-mica orthoclase granite exhibits that of granites derived from typical upper crustal source, and the Tengchong granite exhibits that of transitional crust. The depleted Nd isotope mantle two-stage model age for the Shuangmaidi two-mica orthoclase granite (1.73−1.80 Ga) is close to the depleted Nd mantle model age of the early Paleozoic to late Mesozoic granites within the Baoshan block (1.7−1.9 Ga) [58,72], but significantly larger than that of the Tengliang and Gaoligong granites (1.03−1.43) [70,71], which suggest that the source materials of the Shuangmaidi two-mica orthoclase granite might have not been derived from the previously mentioned metamorphic basement (Lanchang Group, Chongshan Group, Gaoligondshan Group) but derived from relatively older and more mature continental crust.…”

Section: The Age and Characteristics Of The Western Yunnan Crystallinsupporting

confidence: 58%

Zircon SHRIMP U-Pb geochronology, geochemistry and petrogenesis of the upper Eocene Shuangmaidi peraluminous granite in Baoshan Block, Western Yunnan Terrain, southwestern China

Jingning

Chen

Zhai

et al. 2011

Sci. China Earth Sci.

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The Baoshan Block is tectonically located in the middle segment of the Sibumasu plate. Granitic magmatism within the Baoshan Block has been considered weakly active due mainly to very limited exposures during the Himalaya orogenic episode. The geochronological study on the buried Shuangmaidi granite has confirmed the existence of the Cenozoic granitoids in the Baoshan Block. The present study indicates that: (1) It is medium-to coarse-grained two mica phyric granite, characterized by high SiO 2 (73.55%-77.16%) and low CaO (0.34%-1.38%) contents, with a total alkalis (K 2 O+Na 2 O) of 5.22%-8.03%, K 2 O/Na 2 O ratios of 0.24-1.79, and total rare earth elements (ΣREE) of the granite between 85 and 125 ppb. All samples are enriched in light REE and exhibit medium negative Eu anomalies; and they show pronounced negative anomalies in Ba, Sr, Ti, and Nb but significant positive anomalies in K, Rb, U, Th, and Pb on mantle-normalized trace element patterns, indicating typically peraluminous to strongly peraluminous S-type granite.(2) The zircon SHRIMP U-Pb ages of the granite are 36.27±0.48 Ma for the samples from ZK7-1 and 35.78±0.49 Ma for those from ZK0-1, respectively. The similar zircon ages from these two drill cores may suggest that the granite samples come from the same buried pluton. (3) 206 Pb/ 204 Pb values of the granite vary from 20.115 to 25.359, 207 Pb/ 204 Pb from 15.776 to 16.160, and 208 Pb/ 204 Pb from 39.236 to 41.285, showing the characteristics of radioactive lead anomaly of the upper crust. The ( 87 Sr/ 86 Sr) i values calculated on the average age of the two-mica orthoclase granite (36 Ma) range from 0.72524 to 0.77503 and ε Nd (t) values vary from −10.9 to −11.7. These data, along with the depleted-mantle Nd modal ages of 1.73-1.80 Ga, imply that the granites might have formed from partial melting of the Precambrian crystal basements. (4) On the Hf-Rb-Ta diagram, almost all the samples fall within the field of post-collision tectonic setting. The CaO/Na 2 O and Al 2 O 3 /TiO 2 ratios suggest that the granitic magma may have formed from partial melting of clay-rich crustal materials with a possible melting temperature of about 900°C and a possible crystallization temperature of 775-795°C. (5) During the post-collision of the Himalaya orogen, with the southeastward extrusion of the Indochina continent resulting from the continuous northward indentation of the India continent into the Asia, the Gaoligong Fault, as the western boundary of the Indochina continent, moved in the dextral strike-slip on a large scale to trigger partial melting of the thickened crust, and the peraluminous granitic magma from which the Shuangmaidi two-mica orthoclase granite derived was formed. Upper Eocene peraluminous granite, elements and Sr-Nd-Pb isotopic geochemistry, Himalayan post-collision orogenic setting, Baoshan Block, southwestern China Citation: Huang J N, Chen Y Q, Zhai X M, et al. Zircon SHRIMP U-Pb geochronology, geochemistry, and petrogenesis of the upper Eocene Shuangmaidi peraluminous granite in

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“…Alkali feldspar granite with negative ε Hf (127 Ma) values ranged from −9.1 to −5.4 and T DM2 Hf values (1.5-1.7 Ga) were much larger than the crystallization age, thus indicating melting from the ancient crust of the Gaoligong Mountain Group. The two-mica quartz schist in the Gaoligong Mountain Group yielded an [31], and granites formed 498 to 502 Ma in the Tengchong and Baoshan blocks [32]. These data show that ancient crust formed through activation events during the early Paleozoic, and may be related to the Pan-African and early Paleozoic orogenic events of Gondwana [33].…”

Section: Discussionmentioning

confidence: 98%

Magma mixing of granites at Lianghe: In-situ zircon analysis for trace elements, U-Pb ages and Hf isotopes

Cong

Shen

Guang-fu

et al. 2011

Sci. China Earth Sci.

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In this paper, we report an integrated study of trace element, U-Pb age and Hf isotopic composition of zircons from alkali feldspar granites, granodiorites and diorite enclaves in a recently discovered ring complex at Lianghe in western Yunnan, China. The granitoids showed identical U-Pb ages of 127, 115 and 122 Ma, from felsic to mafic, but had different zircon trace elements and Hf isotopic compositions. Trace element content decreased with a gradual increase in ε Hf (t) values of −9.1 to −5.4, −4.5 to 0, and 3.6 to 6.2, respectively. Results indicate that changes in zircon trace elements generally correlate with changes in Hf isotope signatures within single samples and among various granitoids. These relationships reflect the mixing of felsic and mafic magmas. Evidence indicates that depleted mantle-derived mafic magma underplating caused ancient crustal melting, and then formed large-scale granites in Lianghe during the Early Cretaceous. These granodiorites were formed mainly by the mixing of mafic magma and granitic magma.

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U–Pb zircon, geochemical and Sr–Nd–Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong–Baoshan Block, Western Yunnan Province, SW China

Cited by 140 publications

References 62 publications

Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths

Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths

Zircon SHRIMP U-Pb geochronology, geochemistry and petrogenesis of the upper Eocene Shuangmaidi peraluminous granite in Baoshan Block, Western Yunnan Terrain, southwestern China

Magma mixing of granites at Lianghe: In-situ zircon analysis for trace elements, U-Pb ages and Hf isotopes

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