Characteristics and Geological Significance of the Triassic Mungbean Rocks in the Wenquan Town Area, Northern Chongqing

doi:10.19657/j.geoscience.1000-8527.2020.018

Abstract

Abstract:

Altered Triassic volcanic ash beds are widely distributed in South China, and is locally called “mungbean rocks”. In the Pinghongcun and Xiejiacao sections in the Wenquan town (northern Chongqing), these “mungbean rocks” were sampled and X-ray diffraction (XRD) analyzed. Our results show these rocks contain mainly quartz and alkali feldspars, together with clay minerals such as illite and montmorillonite.Zircon morphology, Th/U ratio and zircon REE patterns indicate typical magmatic zircon features. However, geological interpretations yielded from zircon geochemistry of different samples are markedly different. Zircon U-Pb dating reveals that the Pinghongcun sample was formed at (247.2±0.59) Ma (MSWD=2.3, n =30), coeval with the T₁/T₂ boundary (247.2 Ma). The zircon geochemical characteristics indicate an intraplate origin, presumably resulted from the intraplate volcanism after the main-stage Emeishan large igneous province (LIP) activity. The Xiejiacao sample was formed at (225.9±1.4) Ma (MSWD=7.1, n=29), and the zircon geochemistry points to a magmatic arc origin. Combined with regional geology, especially the discovery of the coeval volcanic ash beds to the north (southern margin of North China Block) ,we inferred that the Xiejiacao sample was probably the product of the Mian-Lue Ocean closure.

Key words: Sichuan Basin, mungbean rock, Triassic, zircon U-Pb dating, provenance

CLC Number:

JU Pengcheng, WANG Xunlian, WANG Zhentao, LIU Xifang, ZHONG Jiaai, ZHANG Zaiming. Characteristics and Geological Significance of the Triassic Mungbean Rocks in the Wenquan Town Area, Northern Chongqing[J]. Geoscience, 2020, 34(03): 431-449.

Figures/Tables 14

Fig.1 Tectonic map of Sichuan Basin and its surrounding areas[34] (a), and the geological map of the study area[35] (b)

Fig.2 Outcrop photos and stratigraphic columns of Pinghongcun and Xiejiacao sections

Fig.3 Photomicrographs of samples of PHC-2-R-1 from Pinghongcun and XJC-1-R-1 from Xiejiacao

Fig.4 XRD spectra for samples of PHC-1-R-1(a) and XJC-1-R-1(b)

Table 1 Analysis results of major elements of mungbean rock samples in the Wenquan Town, northern Chongqing(%)

样品号	SiO₂	Al₂O₃	MgO	Na₂O	K₂O	P₂O₅	TiO₂	CaO	TFe₂O₃	MnO	烧失量	总量
PHC-2-R-1	56.56	9.85	8.01	0.08	6.45	0.10	0.23	6.81	1.41	0.01	11.66	101.17
XJC-1-R-1	66.96	14.18	3.84	0.06	11.04	0.05	0.23	0.37	0.60	0.01	3.36	100.96

Table 2 Contents of trace elements and REE of mungbean rock samples from the Wenquan Town, northern Chongqing(10-6)

样品号	Li		Be		Sc		Ti		V		Cr		Mn		Co		Ni		Cu		Zn		Ga
PHC-2-R-1	244.242		3.018		4.137		1 412.657		20.676		11.960		52.123		2.363		5.154		9.136		9.031		13.440
XJC-1-R-1	380.015		4.268		3.373		1 395.092		11.160		3.009		57.954		1.380		1.870		4.084		2.639		17.384
样品号	Ge		As		Rb		Sr		Y		Zr		Nb		Mo		Cd		In		Sn		Sb
PHC-2-R-1	1.585		10.831		43.274		86.299		29.318		101.726		8.772		0.124		0.011		0.056		10.762		0.685
XJC-1-R-1	2.135		6.491		140.523		101.139		23.174		137.673		11.942		0.218		0.002		0.050		8.596		0.526
样品号	Cs		Ba		Hf		Ta		W		Tl		Pb		Bi		Th		U		La		Ce
PHC-2-R-1	2.043		77.542		3.687		0.916		2.470		0.337		8.468		0.683		17.372		5.393		27.256		52.157
XJC-1-R-1	1.964		95.043		5.428		1.332		2.296		0.335		2.857		0.996		30.998		5.736		45.599		99.297
样品号	Pr	Nd		Sm		Eu		Gd		Tb		Dy		Ho		Er		Tm		Yb		Lu	∑REE
PHC-2-R-1	6.387	24.812		5.474		0.355		4.994		0.894		5.660		1.050		3.417		0.472		2.995		0.435	136.357
XJC-1-R-1	11.286	40.372		6.312		0.280		3.752		0.696		4.506		0.819		2.555		0.373		2.349		0.348	218.545

Fig.5 Primitive mantle-normalized spider diagram of the mungbean rock samples from the Wenquan Town, northern Chongqing (Standardized values after reference[38])

Table 3 Contents of trace and rare earth elements of zircons in samples( 10 -6 )

Fig.6 Chondrite-normalized REE patterns of the mungbean rock samples (a) and their zircons (b) in the Wenquan Town, northern Chongqing (standardized values after reference [38])

Fig.7 Representative zircon CL images of the mungbean rock samples in the Wenquan Town, northern Chongqing

Fig.8 LA-ICP-MS zircon U-Pb ages for samples of PHC-2-R-1(a) and XJC-1-R-1(b)

Fig.9 Trace elements lithological discrimination diagrams of the mungbean rock samples from the Wenquan Town, northern Chongqing (base maps of (a) after reference [61], and (b) after reference [62])

Fig.10 Diagrams of Th/U versus age (a), Y versus U/Yb[63] (b), Th/Nb versus Hf/Th[64] (c) and Th/U versus Nb/Hf(d) [64] of zircons in the mungbean rock samples from the Wenquan Town, northern Chongqing

Fig.11 Age distribution of Triassic intermediate-acid magmatic rocks and tuff layers in the South China (age data after references of [33, 60, 95, 99-106])

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