Genesis and Tectonic Significance of Early Jurassic Cuiluan A-type Granite in the Lesser Hinggan Mountains

doi:10.19657/j.geoscience.1000-8527.2023.050

Abstract

Abstract:

The Cuiluan area (Yichun) in the Lesser Hinggan Mountains is located at a critical location for land-sea transition, and is also affected by both the Paleo-Asian Ocean and Pacific tectonic domains.Hence, it has become an important part of the study of regional tectonic evolution.There are different viewpoints on the tectonic setting and geodynamic mechanism for the regional Mesozoic granite emplacement.This constrains the reconstruction of regional tectonic evolution, and hinder the advance of regional prospecting.Basing on the study in geochronology, lithogeochemistry and Hf isotope of the Early Jurassic Cuiluan alkali feldspar granite, we discussed the granitic genesis and its geological significance, which provides a new chronological constraint for better understanding the Early Jurassic regional tectonic evolution.Zircon U-Pb dating results show that the intrusive age of alkali feldspar granite is (189.1± 1.6) Ma (Early Jurassic).The granitic rock is rich in Si, K, and Na and poor in Ca and Mg.It is enriched in Th, Zr, Hf, Ce and Y, but depleted in Ba, Sr, Eu, Nb, Ta and Ti.The zircon saturation temperature is high (804-810 ℃).The total REE content is high (ΣREE=192.60×10^-6-232.80×10^-6).These characteristics show that the granite is A-type, with crustal source affinity. The zircon ε_Hf(t) ranges from +1.46 to + 2.27, with the corresponding crustal model age $T_{\mathrm{DM}}{ }^{\mathrm{C}}$=1133-1088 Ma, indicating that the magma source consists mainly of the juvenile Mesoproterozoic crustal material.On the basis of previous works, we consider that the Early Jurassic magmatic activity at Yichun was closely related to the Paleo-Pacific subduction and attendant tectonic extension of the supra-subduction plate.

Key words: Lesser Hinggan Mountains, A-type granite, Hf isotope, lithogeochemistry, tectonic significance

CLC Number:

P581
P597.1

YANG Yuanjiang, DENG Changzhou, LI Chenglu, YANG Wenpeng, FU Anzong, ZHENG Bo, YUAN Maowen, ZHANG Lidong. Genesis and Tectonic Significance of Early Jurassic Cuiluan A-type Granite in the Lesser Hinggan Mountains[J]. Geoscience, 2023, 37(06): 1597-1608.

Figures/Tables 12

Fig.1 Tectonic map of the Central Asian Orogenic Belt (a) and NE China (b) (modified after reference [11])

Fig.2 Distribution map of granite in Yichun area (a) (modified after reference [31]) and geological map of the study area (b)

Fig.3 Rock specimen photos and microscopic photos of the Cuiluan alkali feldspar granite (Sample No.CL3)

Table 1 Zircon U-Pb dating results of the Cuiluan alkali feldspar granite

测点号	元素含量(10^-6)			Th/U	比值									年龄(Ma)
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ		²⁰⁷Pb/ ²³⁵U		²⁰⁶Pb/ ²³⁸U		1σ		²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
CL3-01	7.71	117.0	223	0.52	0.0 554		0.0 033		0.2 212		0.0 290		0.0 004	427.8	133.3 200	202.9	10.8 979	184.6	2.4 853
CL3-02	7.06	103.0	202	0.51	0.0 493		0.0 028		0.2 026		0.0 302		0.0 004	164.9	133.3 150	187.3	9.3 216	191.6	2.7 146
CL3-03	8.26	139.0	234	0.59	0.0 529		0.0 025		0.2 161		0.0 297		0.0 003	327.8	105.5 425	198.6	8.1 512	188.7	2.1 670
CL3-04	6.80	90.5	199	0.45	0.0 500		0.0 027		0.2 031		0.0 296		0.0 004	194.5	130.5 375	187.8	9.1 419	188.1	2.3 982
CL3-05	8.05	106.0	232	0.46	0.0 514		0.0 027		0.2 143		0.0 303		0.0 004	257.5	122.2 050	197.2	9.2 817	192.3	2.4 385
CL3-06	8.72	146.0	241	0.61	0.0 495		0.0 024		0.2 074		0.0 305		0.0 004	172.3	111.0 950	191.3	8.0 317	193.5	2.4 243
CL3-07	11.32	181.0	330	0.55	0.0 537		0.0 021		0.2 123		0.0 287		0.0 003	366.7	95.3 600	195.5	6.7 753	182.6	1.9 873
CL3-08	6.86	94.7	197	0.48	0.0 490		0.0 026		0.2 043		0.0 302		0.0 004	146.4	158.3 125	188.8	8.3 389	191.9	2.5 891
CL3-09	8.28	107.0	238	0.45	0.0 510		0.0 027		0.2 089		0.0 302		0.0 004	239.0	128.6 850	192.6	8.4 208	191.8	2.4 298
CL3-10	17.11	307.0	482	0.64	0.0 508		0.0 018		0.2 056		0.0 293		0.0 003	231.6	86.0 975	189.8	5.8 765	186.4	1.9 368
CL3-11	15.87	202.0	457	0.44	0.0 513		0.0 020		0.2 141		0.0 302		0.0 003	253.8	90.7 275	197.0	6.8 858	191.7	2.0 755
CL3-12	12.97	212.0	361	0.59	0.0 526		0.0 021		0.2 187		0.0 300		0.0 003	322.3	123.1 350	200.8	7.3 101	190.5	2.0 353
CL3-13	11.80	153.0	342	0.45	0.0 517		0.0 022		0.2 138		0.0 299		0.0 004	276.0	98.1 325	196.8	7.7 240	189.8	2.2 624
CL3-14	7.20	97.1	205	0.47	0.0 512		0.0 027		0.2 106		0.0 300		0.0 004	250.1	122.2 050	194.1	9.0 121	190.6	2.4 527
CL3-15	4.70	65.4	133	0.49	0.0 484		0.0 037		0.2 034		0.0 306		0.0 005	120.5	179.6 000	188.0	12.0 015	194.4	3.2 822
CL3-16	8.01	144.0	211	0.68	0.0 503		0.0 027		0.2 094		0.0 303		0.0 004	205.6	122.2 050	193.1	9.0 075	192.2	2.4 913
CL3-17	8.51	146.0	235	0.62	0.0 500		0.0 030		0.2 018		0.0 294		0.0 004	198.2	140.7 225	186.6	9.8 710	186.5	2.7 089
CL3-18	7.45	103.0	211	0.49	0.0 494		0.0 025		0.2 025		0.0 301		0.0 004	164.9	120.3 525	187.3	8.0 838	191.4	2.5 734
CL3-19	6.20	93.4	178	0.52	0.0 462		0.0 033		0.1 820		0.0 288		0.0 004	5.7	166.6 500	169.7	10.4 249	183.0	2.4 091
CL3-20	10.24	215.0	265	0.81	0.0 562		0.0 028		0.2 258		0.0 295		0.0 004	457.5	112.9 500	206.7	8.8 355	187.1	2.4 905

Table 1 Zircon U-Pb dating results of the Cuiluan alkali feldspar granite

测点号	元素含量(10^-6)			Th/U	比值									年龄(Ma)
测点号	Pb	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ		²⁰⁷Pb/ ²³⁵U		²⁰⁶Pb/ ²³⁸U		1σ		²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
CL3-01	7.71	117.0	223	0.52	0.0 554		0.0 033		0.2 212		0.0 290		0.0 004	427.8	133.3 200	202.9	10.8 979	184.6	2.4 853
CL3-02	7.06	103.0	202	0.51	0.0 493		0.0 028		0.2 026		0.0 302		0.0 004	164.9	133.3 150	187.3	9.3 216	191.6	2.7 146
CL3-03	8.26	139.0	234	0.59	0.0 529		0.0 025		0.2 161		0.0 297		0.0 003	327.8	105.5 425	198.6	8.1 512	188.7	2.1 670
CL3-04	6.80	90.5	199	0.45	0.0 500		0.0 027		0.2 031		0.0 296		0.0 004	194.5	130.5 375	187.8	9.1 419	188.1	2.3 982
CL3-05	8.05	106.0	232	0.46	0.0 514		0.0 027		0.2 143		0.0 303		0.0 004	257.5	122.2 050	197.2	9.2 817	192.3	2.4 385
CL3-06	8.72	146.0	241	0.61	0.0 495		0.0 024		0.2 074		0.0 305		0.0 004	172.3	111.0 950	191.3	8.0 317	193.5	2.4 243
CL3-07	11.32	181.0	330	0.55	0.0 537		0.0 021		0.2 123		0.0 287		0.0 003	366.7	95.3 600	195.5	6.7 753	182.6	1.9 873
CL3-08	6.86	94.7	197	0.48	0.0 490		0.0 026		0.2 043		0.0 302		0.0 004	146.4	158.3 125	188.8	8.3 389	191.9	2.5 891
CL3-09	8.28	107.0	238	0.45	0.0 510		0.0 027		0.2 089		0.0 302		0.0 004	239.0	128.6 850	192.6	8.4 208	191.8	2.4 298
CL3-10	17.11	307.0	482	0.64	0.0 508		0.0 018		0.2 056		0.0 293		0.0 003	231.6	86.0 975	189.8	5.8 765	186.4	1.9 368
CL3-11	15.87	202.0	457	0.44	0.0 513		0.0 020		0.2 141		0.0 302		0.0 003	253.8	90.7 275	197.0	6.8 858	191.7	2.0 755
CL3-12	12.97	212.0	361	0.59	0.0 526		0.0 021		0.2 187		0.0 300		0.0 003	322.3	123.1 350	200.8	7.3 101	190.5	2.0 353
CL3-13	11.80	153.0	342	0.45	0.0 517		0.0 022		0.2 138		0.0 299		0.0 004	276.0	98.1 325	196.8	7.7 240	189.8	2.2 624
CL3-14	7.20	97.1	205	0.47	0.0 512		0.0 027		0.2 106		0.0 300		0.0 004	250.1	122.2 050	194.1	9.0 121	190.6	2.4 527
CL3-15	4.70	65.4	133	0.49	0.0 484		0.0 037		0.2 034		0.0 306		0.0 005	120.5	179.6 000	188.0	12.0 015	194.4	3.2 822
CL3-16	8.01	144.0	211	0.68	0.0 503		0.0 027		0.2 094		0.0 303		0.0 004	205.6	122.2 050	193.1	9.0 075	192.2	2.4 913
CL3-17	8.51	146.0	235	0.62	0.0 500		0.0 030		0.2 018		0.0 294		0.0 004	198.2	140.7 225	186.6	9.8 710	186.5	2.7 089
CL3-18	7.45	103.0	211	0.49	0.0 494		0.0 025		0.2 025		0.0 301		0.0 004	164.9	120.3 525	187.3	8.0 838	191.4	2.5 734
CL3-19	6.20	93.4	178	0.52	0.0 462		0.0 033		0.1 820		0.0 288		0.0 004	5.7	166.6 500	169.7	10.4 249	183.0	2.4 091
CL3-20	10.24	215.0	265	0.81	0.0 562		0.0 028		0.2 258		0.0 295		0.0 004	457.5	112.9 500	206.7	8.8 355	187.1	2.4 905

Fig.4 Cathodoluminescence (CL) images of zircon from the Cuiluan alkali feldspar granite

Fig.5 U-Pb concordant diagram (a) and 206Pb/238U age distribution diagram (b) of zircons from the Cuiluan alkali feldspar granite

Table 2 Major element(%) and trace element (10-6) compositions and characteristic parameters of the Cuiluan alkali feldspar granites

样品编号	SiO₂		TiO₂		Al₂O₃		TFe₂O₃		MnO		MgO		CaO		Na₂O		K₂O		P₂O₅		LOI		Mg^#
CL3-25	72.39		0.26		13.91		1.79		0.05		0.36		0.99		3.83		5.43		0.05		0.42		16.42
CL3-31	72.70		0.28		13.71		2.00		0.05		0.39		1.10		3.88		5.11		0.06		0.63		16.21
CL3-32	74.04		0.24		13.13		1.74		0.04		0.30		0.94		3.72		4.88		0.05		0.56		14.44
CL3-33	73.80		0.26		13.38		1.83		0.03		0.36		1.00		3.79		4.87		0.05		0.49		16.16
CL3-34	73.65		0.25		13.56		1.63		0.03		0.37		0.94		3.44		5.87		0.05		0.54		18.18
CL3-35	73.97		0.24		13.20		1.73		0.04		0.29		0.94		3.71		4.85		0.05		0.56		14.39
样品编号	Na₂O+K₂O		Be		Sc		V		Cr		Co		Ni		Ga		Rb		Sr		Y		Zr
CL3-25	9.26		4.81		3.09		9.37		0.75		1.64		1.05		18.00		271		109.0		30.4		212
CL3-31	8.98		4.00		3.28		11.30		2.48		1.92		1.50		17.80		246		109.0		38.6		247
CL3-32	8.59		4.28		2.55		8.67		1.04		1.48		1.22		17.00		243		87.7		30.8		204
CL3-33	8.66		4.26		2.99		9.73		1.28		1.58		1.27		17.40		225		98.8		37.1		221
CL3-34	9.32		3.64		3.16		9.51		1.90		1.66		1.79		17.30		264		101.0		34.5		221
CL3-35	8.56		3.89		2.96		9.07		0.86		1.49		1.13		17.50		221		96.7		36.5		229
样品编号	Nb		Sn		Cs		Ba		La		Ce		Pr		Nd		Sm		Eu		Gd		Tb
CL3-25	13.5		2.40		6.14		531		51.1		105.0		11.5		38.9		7.02		0.72		4.92		0.80
CL3-31	16.1		3.61		5.39		499		46.6		97.0		11.0		38.0		7.43		0.72		5.73		0.97
CL3-32	13.0		1.87		4.57		410		41.2		84.6		9.4		32.2		6.14		0.65		4.80		0.78
CL3-33	15.0		4.75		3.80		432		44.8		93.6		10.5		36.7		7.01		0.63		5.95		0.96
CL3-34	13.5		3.73		3.58		470		48.7		98.6		10.8		36.7		6.73		0.66		5.20		0.87
CL3-35	15.4		4.73		3.78		423		44.1		92.1		10.3		36.8		7.11		0.69		5.91		0.96
样品编号	Dy	Ho		Er		Tm		Yb		Lu		Hf		Ta		Tl		Pb		Th	U	A/NK
CL3-25	5.13	0.99		2.91		0.46		2.90		0.45		6.23		1.08		1.94		21.1		30.9	11.3	1.14
CL3-31	6.22	1.21		3.58		0.60		3.64		0.53		7.32		1.44		1.73		18.9		39.4	14.7	1.15
CL3-32	5.07	0.97		2.91		0.46		3.02		0.42		6.24		1.14		1.76		18.5		55.1	15.1	1.15
CL3-33	6.30	1.22		3.62		0.59		3.53		0.56		6.62		1.19		1.56		15.3		35.9	12.1	1.16
CL3-34	5.31	1.11		3.31		0.54		3.43		0.53		6.48		1.14		1.87		17.3		37.3	12.9	1.13
CL3-35	6.00	1.21		3.74		0.59		3.50		0.54		7.05		1.17		1.46		15.0		36.7	12.3	1.16
样品编号	A/CNK		∑REE		∑LREE		∑HREE		LREE/HREE				δEu		(La/Yb)_N				Zr+Nb+Ce+Y
CL3-25	1.00		232.80		214.24		18.56		11.54				0.36		11.88				361.23
CL3-31	0.99		223.23		200.75		22.48		8.93				0.33		8.63				398.70
CL3-32	1.00		192.60		174.17		18.43		9.45				0.35		9.20				332.22
CL3-33	1.00		215.97		193.24		22.73		8.50				0.29		8.56				366.38
CL3-34	0.99		222.49		202.19		20.30		9.96				0.33		9.57				367.37
CL3-35	1.01		213.55		191.10		22.45		8.51				0.32		8.49				373.19

Table 2 Major element(%) and trace element (10-6) compositions and characteristic parameters of the Cuiluan alkali feldspar granites

样品编号	SiO₂		TiO₂		Al₂O₃		TFe₂O₃		MnO		MgO		CaO		Na₂O		K₂O		P₂O₅		LOI		Mg^#
CL3-25	72.39		0.26		13.91		1.79		0.05		0.36		0.99		3.83		5.43		0.05		0.42		16.42
CL3-31	72.70		0.28		13.71		2.00		0.05		0.39		1.10		3.88		5.11		0.06		0.63		16.21
CL3-32	74.04		0.24		13.13		1.74		0.04		0.30		0.94		3.72		4.88		0.05		0.56		14.44
CL3-33	73.80		0.26		13.38		1.83		0.03		0.36		1.00		3.79		4.87		0.05		0.49		16.16
CL3-34	73.65		0.25		13.56		1.63		0.03		0.37		0.94		3.44		5.87		0.05		0.54		18.18
CL3-35	73.97		0.24		13.20		1.73		0.04		0.29		0.94		3.71		4.85		0.05		0.56		14.39
样品编号	Na₂O+K₂O		Be		Sc		V		Cr		Co		Ni		Ga		Rb		Sr		Y		Zr
CL3-25	9.26		4.81		3.09		9.37		0.75		1.64		1.05		18.00		271		109.0		30.4		212
CL3-31	8.98		4.00		3.28		11.30		2.48		1.92		1.50		17.80		246		109.0		38.6		247
CL3-32	8.59		4.28		2.55		8.67		1.04		1.48		1.22		17.00		243		87.7		30.8		204
CL3-33	8.66		4.26		2.99		9.73		1.28		1.58		1.27		17.40		225		98.8		37.1		221
CL3-34	9.32		3.64		3.16		9.51		1.90		1.66		1.79		17.30		264		101.0		34.5		221
CL3-35	8.56		3.89		2.96		9.07		0.86		1.49		1.13		17.50		221		96.7		36.5		229
样品编号	Nb		Sn		Cs		Ba		La		Ce		Pr		Nd		Sm		Eu		Gd		Tb
CL3-25	13.5		2.40		6.14		531		51.1		105.0		11.5		38.9		7.02		0.72		4.92		0.80
CL3-31	16.1		3.61		5.39		499		46.6		97.0		11.0		38.0		7.43		0.72		5.73		0.97
CL3-32	13.0		1.87		4.57		410		41.2		84.6		9.4		32.2		6.14		0.65		4.80		0.78
CL3-33	15.0		4.75		3.80		432		44.8		93.6		10.5		36.7		7.01		0.63		5.95		0.96
CL3-34	13.5		3.73		3.58		470		48.7		98.6		10.8		36.7		6.73		0.66		5.20		0.87
CL3-35	15.4		4.73		3.78		423		44.1		92.1		10.3		36.8		7.11		0.69		5.91		0.96
样品编号	Dy	Ho		Er		Tm		Yb		Lu		Hf		Ta		Tl		Pb		Th	U	A/NK
CL3-25	5.13	0.99		2.91		0.46		2.90		0.45		6.23		1.08		1.94		21.1		30.9	11.3	1.14
CL3-31	6.22	1.21		3.58		0.60		3.64		0.53		7.32		1.44		1.73		18.9		39.4	14.7	1.15
CL3-32	5.07	0.97		2.91		0.46		3.02		0.42		6.24		1.14		1.76		18.5		55.1	15.1	1.15
CL3-33	6.30	1.22		3.62		0.59		3.53		0.56		6.62		1.19		1.56		15.3		35.9	12.1	1.16
CL3-34	5.31	1.11		3.31		0.54		3.43		0.53		6.48		1.14		1.87		17.3		37.3	12.9	1.13
CL3-35	6.00	1.21		3.74		0.59		3.50		0.54		7.05		1.17		1.46		15.0		36.7	12.3	1.16
样品编号	A/CNK		∑REE		∑LREE		∑HREE		LREE/HREE				δEu		(La/Yb)_N				Zr+Nb+Ce+Y
CL3-25	1.00		232.80		214.24		18.56		11.54				0.36		11.88				361.23
CL3-31	0.99		223.23		200.75		22.48		8.93				0.33		8.63				398.70
CL3-32	1.00		192.60		174.17		18.43		9.45				0.35		9.20				332.22
CL3-33	1.00		215.97		193.24		22.73		8.50				0.29		8.56				366.38
CL3-34	0.99		222.49		202.19		20.30		9.96				0.33		9.57				367.37
CL3-35	1.01		213.55		191.10		22.45		8.51				0.32		8.49				373.19

Fig.6 TAS diagram (a)(modified after reference [39]), K2O-SiO2 diagram (b) (modified after reference [40])and A/NK-A/CNK diagram (c)(modified after reference [41])of the Cuiluan alkali feldspar granite

Fig.7 Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagram (b) of the Cuiluan alkali feldspar granite

Table 3 Zircon Hf isotope analysis results of the Cuiluan alkali feldspar granite

序号	点号	U-Pb年龄(Ma)	¹⁷⁶Yb/ ¹⁷⁷Hf	1σ	¹⁷⁶Lu/ ¹⁷⁷Hf	1σ	¹⁷⁶Hf/ ¹⁷⁷Hf	1σ	ε_Hf(0)	ε_Hf(t)	1σ	T_DM1 (Ma)	$T D M C$ (Ma)	f_Lu/Hf
1	CL3-01	185	0.031048	0.000009	0.000889	0.000011	0.282712	0.000462	-2.11	1.840	16.36	763	1110	-0.973222
2	CL3-02	192	0.027737	0.000010	0.000824	0.000007	0.282720	0.000309	-1.84	2.268	10.92	751	1088	-0.975196
3	CL3-03	189	0.035169	0.000009	0.001000	0.000013	0.282715	0.000640	-2.02	2.000	22.65	762	1103	-0.969886
4	CL3-04	188	0.025450	0.000009	0.000738	0.000006	0.282707	0.000273	-2.28	1.757	9.66	767	1118	-0.977759
5	CL3-05	192	0.031139	0.000009	0.000875	0.000006	0.282716	0.000277	-1.98	2.132	9.81	758	1098	-0.973655
6	CL3-06	194	0.038944	0.000009	0.001091	0.000008	0.282718	0.000310	-1.91	2.200	10.98	759	1094	-0.967127
7	CL3-07	183	0.041288	0.000009	0.001171	0.000021	0.282704	0.000811	-2.41	1.463	28.68	781	1133	-0.964720
8	CL3-08	192	0.035492	0.000009	0.001001	0.000039	0.282718	0.001419	-1.91	2.179	50.21	757	1094	-0.969837
9	CL3-09	192	0.036861	0.000009	0.001050	0.000011	0.282711	0.000431	-2.15	1.929	15.25	768	1110	-0.968380
10	CL3-10	186	0.049822	0.000010	0.001389	0.000023	0.282708	0.001064	-2.26	1.663	37.63	779	1123	-0.958164

Table 3 Zircon Hf isotope analysis results of the Cuiluan alkali feldspar granite

序号	点号	U-Pb年龄(Ma)	¹⁷⁶Yb/ ¹⁷⁷Hf	1σ	¹⁷⁶Lu/ ¹⁷⁷Hf	1σ	¹⁷⁶Hf/ ¹⁷⁷Hf	1σ	ε_Hf(0)	ε_Hf(t)	1σ	T_DM1 (Ma)	$T D M C$ (Ma)	f_Lu/Hf
1	CL3-01	185	0.031048	0.000009	0.000889	0.000011	0.282712	0.000462	-2.11	1.840	16.36	763	1110	-0.973222
2	CL3-02	192	0.027737	0.000010	0.000824	0.000007	0.282720	0.000309	-1.84	2.268	10.92	751	1088	-0.975196
3	CL3-03	189	0.035169	0.000009	0.001000	0.000013	0.282715	0.000640	-2.02	2.000	22.65	762	1103	-0.969886
4	CL3-04	188	0.025450	0.000009	0.000738	0.000006	0.282707	0.000273	-2.28	1.757	9.66	767	1118	-0.977759
5	CL3-05	192	0.031139	0.000009	0.000875	0.000006	0.282716	0.000277	-1.98	2.132	9.81	758	1098	-0.973655
6	CL3-06	194	0.038944	0.000009	0.001091	0.000008	0.282718	0.000310	-1.91	2.200	10.98	759	1094	-0.967127
7	CL3-07	183	0.041288	0.000009	0.001171	0.000021	0.282704	0.000811	-2.41	1.463	28.68	781	1133	-0.964720
8	CL3-08	192	0.035492	0.000009	0.001001	0.000039	0.282718	0.001419	-1.91	2.179	50.21	757	1094	-0.969837
9	CL3-09	192	0.036861	0.000009	0.001050	0.000011	0.282711	0.000431	-2.15	1.929	15.25	768	1110	-0.968380
10	CL3-10	186	0.049822	0.000010	0.001389	0.000023	0.282708	0.001064	-2.26	1.663	37.63	779	1123	-0.958164

Fig.8 10000×Ga/Al-(K2O+Na2O)(a) and (Zr+Nb+Ce+Y)-(K2O+Na2O)/CaO (b) discrimination diagrams of the Cuiluan alkali feldspar granite (basemap modified after reference [54])

Fig.9 Zircon age vs.εHf (t) (a)and 176Hf/177Hf-t(b)diagrams for the Cuiluan alkali feldspar granite

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