Petrogenesis of the Early Cretaceous Laguila bimodal intrusive rocks from the Tethyan Himalaya: Implications for the break-up of Eastern Gondwana

Liu, Zheng; Zhou, Qing; Lai, Yang; Qing, Chengshi; Li, Yingxu; Wu, Jianyang; Xiang-biao, Xia

doi:10.1016/j.lithos.2015.09.006

Cited by 54 publications

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“…In contrast, the second group (granite) is characterized by a higher ε Hf ( t ) value (−1.5 to 8.9) and higher light rare earth fractionation ((La/Yb) N = 36.4 to 52.5). The first group exhibits similar geochemical characteristics with previously reported Sangxiu Formation dacite and Laguila felsic rocks (Z. Liu et al, ; D. Zhu et al, ; Figure c,d), which have been considered to originate from the anatexis of ensialic continental crust. The zircon ε Hf is significantly different from the coeval mafic rock (ε Hf ( t ) values range from −4.8 to 5.7), ruling out the magma differentiation model.…”

Section: Discussionsupporting

confidence: 83%

“…Chondrite‐normalized (Boynton, ) REE patterns and primitive mantle‐normalized (McDonough, McCulloch, & Sun, ) trace elements patterns for the Kada igneous rocks. The Comei mafic rocks and Laguila felsic rocks are also shown for comparison (D. Zhu et al, ; Z. Liu et al, ). OIB and N‐MORB data are from Sun and McDonough () [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Results of the palaeomagnetic reconstruction indicate that during the Early Cretaceous, the Comei LIP (134–130 Ma; Z. Liu et al, ; D. Zhu et al, ; D. C. Zhu et al, ) and Bunbury basalts (130.45–136.96 Ma; Olierook et al, ) were both located on the eastern margin of Gondwana (Figure ). The precisely dated results of these rocks indicate that the rocks were formed coeval with the initial break‐up of East Gondwana (145–136 Ma; Gibbons et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…This suggests that Kerguelen plume may have been affected by the Comei igneous area and the Bunbury basalt area. Furthermore, the distribution of the Comei igneous area and the Bunbury basalt area is much larger than were previously understood (Y. Q. Liu et al, ; Z. Liu et al, ; Wang et al, ). The Comei basaltic rock also shares geochemical composition affinities with basalt within the Kerguelen plateau.…”

Section: Introductionmentioning

confidence: 91%

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Petrogenesis of theEarlyCretaceousKada igneous rocks fromTethyanHimalaya: Implications for initial break‐up of easternGondwana

et al. 2018

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Early Cretaceous magmatic rocks associated with the Kerguelen mantle plume are widespread in the Comei area with a chronology concentrated from 134 to 130 Ma.However, less data for the earliest Early Cretaceous magmatic rocks cropping out in the Comei area have been reported. The earliest Early Cretaceous magmatic rocks from the Kada area comprise mafic rock (diabase) and felsic rocks (granite, dacite, and quartz monzonite). This paper presents a detailed LA-ICP-MS zircon U-Pb chronology with major and minor (trace) elements and Lu-Hf isotope data from Kada igneous rocks to identify the extent of the early activity of the Kerguelen mantle plume and the initial break-up of eastern Gondwanaland. The LA-ICP-MS zircon U-Pb dates reveal that the age of Kada magmatic rocks range from 136.9 to 143.5 Ma. Kada mafic rocks exhibit both OIB (Samples KD3 and KD06) and N-MORB (Sample KD7-1) characteristics. The N-MORB-type mafic rocks were derived from partial melting of depleted spinel lherzolite. However, the OIB-type mafic rocks were derived from partial melting (~60-80 km) of spinel + garnet lherzolite. Kada felsic rocks show obvious enrichment of light rare earth elements and negative Eu anomaly features. Among these, dacite and quartz monzonite rocks show flat heavy rare earth elements and clear Nb, Ta, P, and Ti negative anomalies with depleted ε Hf (t) characteristics (−11.0 to −21.0). This is indicative of partial melting of specific crustal rocks in an intraplate environment caused by underplating of coeval basaltic magmas. However, granite is characterized by high heavy rare earth element fractionation and high and dispersed ε Hf composition (−1.5 to +8.9), thus indicating that granite is derived from extensive fractional crystallization of mantle-derived melts from an AFC process. The Kada felsic rocks show A-type granitic characteristics in an extensional environment. Based on the evidence from palaeomagnetism reconstructions, Kada rocks and Bunbury basalts are both distributed in and influence the scope of the Kerguelen mantle plume. They are also coeval with the initial break-up of eastern Gondwana. We suggest that Kada magmatic rocks in southern Tibet represent the earliest activity of the Kerguelen mantle plume and that they played a role in the initial break-up of eastern Gondwana.

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Section: Discussionsupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

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Petrogenesis of theEarlyCretaceousKada igneous rocks fromTethyanHimalaya: Implications for initial break‐up of easternGondwana

et al. 2018

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“…B. Gou et al, ; Z. C. Liu, Wu, Ding, et al, ; X. C. Liu, Wu, Yu, et al, ; Zeng et al, ; Zeng, Gao, Xie, & Jing, ; Zheng et al, ) intruded into the Palaeozoic (530–470 Ma) granitic gneiss (Ding et al, ; Weinberg, ; F. Y. Wu, Liu, Liu, & Ji, ; Zhang, Xiang, et al, ). In the east‐central area, widespread Early Cretaceous bimodal magmatic rocks (Zhu et al, ; Zhu et al, ), including basaltic lava, diabase, gabbro intrusions, and scarce ultrabasic rocks and felsic dykes, were emplaced (Figure ; Z. Liu et al, ; Wei, Liang, Shang, Zhang, & Pan, ). In addition, Eocene felsic leucogranitic dykes and gabbro‐diabase dykes are also developed (Ji et al, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

Cambrian magmatism in the Tethys Himalaya and implications for the evolution of the Proto‐Tethys along the northern Gondwana margin: A case study and overview

Zhang

Santosh

et al. 2018

Geological Journal

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The Cuonadong Dome in southern Tibet is a newly discovered gneiss dome in the Tethys Himalaya. Here, we investigate the Late Cambrian augen gneiss (orthogneiss) within the core of this dome to address the controversy surrounding early Palaeozoic tectonic evolution of the northern margin of eastern Gondwana. We report new zircon laser ablation multicollector inductively coupled plasma mass spectrometry (LA‐(MC‐)ICP‐MS) U‐Pb ages, Lu‐Hf isotopes, whole‐rock major and trace element geochemistry, and Sr‐Nd‐Pb data on representative samples from the granitic gneiss. The weighted mean of 116 analyses of zircon grains yields an age of 498.2 ± 1.5 Ma (mean square weighted deviation [MSWD] = 1.2). Forty‐one spots analyses on these grains show consistent εHf (t) values of −2 to +4 (average = +1.1), corresponding to Hf crustal model age (TDM2) of 1.3 to 1.6 Ga (average = 1.39 Ga). The orthogneiss (metagranite) is characterized by high Si and K contents, with low Al, Mg, and Ti, and A/CNK values ranging from 0.87 to 0.98 with an average of 0.92, indicating a metaluminous composition and I‐type granitoid affinity. The granitoid displays significant enrichment in light rare earth elements (LREEs) and relatively flat high rare earth element (HREE) patterns, with strong negative Eu anomalies (Eu/Eu* = 0.26–0.31). The primitive mantle‐normalized trace elements show a relative enrichment in large‐ion lithophile elements, such as Rb, and high‐field strength elements, such as Th, U, Zr, and Hf, with depletion in Ba, Nb, Ta, Sr, P, and Ti. The rocks show high initial 87Sr/86Sr ratios (0.7221–0.7248) and low εNd (t) values (−8.9 to −7.3) with Nd model ages (TDM) of 1.79–1.91 Ga. Their radiogenic Pb isotopic compositions show (206Pb/204Pb)t = 18.804–19.110, (207Pb/204Pb)t = 15.730–15.768, and (208Pb/204Pb)t = 38.409–39.054, indicating an ancient upper middle continental crustal origin. Our study shows that the protolith of the metagranite was most likely derived from the partial melting of upper continental crust with a minor contribution of depleted mantle materials. Through integration of the regional information on early Palaeozoic magmatism and metamorphic events, we contend that the protolith of the Cuonadong granitic gneiss formed in an accretionary setting associated with the early Palaeozoic Proto‐Tethys Oceanic plate subduction beneath the Gondwana continent.

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Variable Melt Production Rate of the Kerguelen HotSpot Due To Long‐Term Plume‐Ridge Interaction

Bredow

Steinberger

2018

Geophysical Research Letters

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For at least 120 Myr, the Kerguelen plume has distributed enormous amounts of magmatic rocks over various igneous provinces between India, Australia, and Antarctica. Previous attempts to reconstruct the complex history of this plume have revealed several characteristics that are inconsistent with properties typically associated with plumes. To explore the geodynamic behavior of the Kerguelen hotspot, and in particular address these inconsistencies, we set up a regional viscous flow model with the mantle convection code ASPECT. Our model features complex time‐dependent boundary conditions in order to explicitly simulate the surrounding conditions of the Kerguelen plume. We show that a constant plume influx can result in a variable magma production rate if the plume interacts with nearby spreading ridges and that a dismembered plume, multiple plumes, or solitary waves in the plume conduit are not required to explain the fluctuating magma output and other unusual characteristics attributed to the Kerguelen hotspot.

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Petrogenesis of the Early Cretaceous Laguila bimodal intrusive rocks from the Tethyan Himalaya: Implications for the break-up of Eastern Gondwana

Cited by 54 publications

References 49 publications

Petrogenesis of theEarlyCretaceousKada igneous rocks fromTethyanHimalaya: Implications for initial break‐up of easternGondwana

Petrogenesis of theEarlyCretaceousKada igneous rocks fromTethyanHimalaya: Implications for initial break‐up of easternGondwana

Cambrian magmatism in the Tethys Himalaya and implications for the evolution of the Proto‐Tethys along the northern Gondwana margin: A case study and overview

Variable Melt Production Rate of the Kerguelen HotSpot Due To Long‐Term Plume‐Ridge Interaction

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