Petrogenesis and Tectonic Implications of Intermediate Basic Rocks from Kawabulak Complex in Central Tianshan: Constraints from Elemental Geochemistry and Sr-Nd-Pb Isotopes

Abstract

Abstract:

The study of the petrogenesis of Kawabulak Complex has great significance to reconstruct Paleozoic oceanic-continental framework and tectonic evolution processes of southern central Tianshan. On the basis of mineralogical and petrological examinations,major and trace elements and Sr-Nd-Pb isotopes of the intermediate basic components from Kawabulack Complex are studied. The rock samples are mainly of low-K-tholeiite series with relatively high contents of Na. These rocks are relatively enriched in LREEs (Rb, U, Sr) and LILEs, and are depleted in HREE and HFSE (Nb, Ta, Zr). Sr-Nd-Pb isotopic geochemistry shows that the values of I_Sr range from 0.706 to 0.709, while ε_Nd(t)values change from 6.84 to 9.76. They have relatively low Pb isotopic compositions characterized by (²⁰⁶Pb/²⁰⁴Pb)_i=18.015-18.239, (²⁰⁷Pb/²⁰⁴Pb)_i=15.573-15.593 and (²⁰⁸Pb/²⁰⁴Pb)_i=37.871-38.207. Combining with previous studies and regional geology, the authors have come to the conclusion that the parent magma of intermediate-basic rocks from Kawabulak Complex, as a product of island arc magmatism, is originated from a juvenile lithospheric mantle that was previously metasomatized by subduction zone fluids/melts in the Paleozoic, representing a section of Late Paleozoic magmatic arc of this region.

Key words: central Tianshan, Kawabulak, medium-basis rock, Sr-Nd-Pb isotopes, lithology

CLC Number:

P588.1

MADINA Nurtay, NIJAT Abdurusul, MUHTAR Zari, WU Zhaoning, ZHANG Long. Petrogenesis and Tectonic Implications of Intermediate Basic Rocks from Kawabulak Complex in Central Tianshan: Constraints from Elemental Geochemistry and Sr-Nd-Pb Isotopes[J]. Geoscience, 2017, 31(06): 1147-1156.

Figures/Tables 14

References 60

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样品号	SiO₂	TiO₂		Al₂O₃			TFe₂O₃			MgO			MnO			CaO			Na₂O			K₂O			P₂O₅			LOl			Mg^#			Na₂O/ K₂O			Na₂O+ K₂O			σ			A/CNK			A/NK
KB111	55.84	0.58		14.83			5.47			1.85			0.11			7.77			6.50			0.40			0.20			5.82			25.27			16.14			6.90			3.71			0.591			1.342
KB211	49.36	0.52		18.26			5.98			7.96			0.10			13.81			1.74			0.30			0.05			1.23			57.09			5.70			2.04			0.66			0.649			5.764
KB221	49.68	0.55		14.30			7.76			10.35			0.12			13.14			1.27			0.39			0.04			1.71			57.15			3.24			1.66			0.41			0.545			5.731
KB411	52.00	1.07		17.66			9.21			4.38			0.16			8.03			2.98			1.86			0.36			1.46			32.24			1.60			4.84			2.60			0.826			2.572
KB421	44.41	1.36		17.99			11.55			6.00			0.16			12.23			2.31			1.13			0.23			2.04			34.20			2.04			3.45			8.45			0.664			3.596
KB611	43.80	1.54		17.02			11.51			7.35			0.17			12.68			1.99			0.68			0.51			2.19			38.99			2.93			2.68			8.93			0.630			4.263
样品号	La	Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			LREE			HREE
KB111	29.755	28.722			26.737			24.775			20.941			19.093			17.100			14.904			13.528			12.693			12.290			11.373			11.489			11.630			150.024			105.006
KB211	24.624	24.023			22.295			21.126			17.556			16.190			14.676			12.850			11.654			10.756			10.138			9.035			8.746			8.315			125.814			86.170
KB221	17.232	17.056			16.093			15.593			13.804			13.562			11.825			10.845			10.150			9.633			9.275			8.573			8.359			8.094			93.339			76.753
KB411	81.848	74.020			62.189			52.934			37.176			28.128			26.706			21.727			18.780			17.286			16.580			15.333			15.118			14.992			336.295			146.522
KB421	42.608	41.601			38.358			36.158			28.967			24.621			22.316			18.524			15.992			14.647			13.680			12.055			11.500			10.929			212.313			119.643
KB611	48.979	53.301			52.968			52.505			42.654			33.031			32.983			26.594			22.772			20.618			18.937			16.196			15.071			13.850			283.438			167.020
样品号	ΣREE		LREE/ HREE			Rb			Ba			Th			U			Nb			Ta			K			La			Ce			Pb			Pr			Sr			P			Nd
KB111	255.029		1.428			20.953			6.148			12.400			23.034			6.100			6.476			19.275			10.883			10.494			17.987			10.000			8.216			15.484			9.256
KB211	211.984		1.46			10.313			19.582			7.286			16.167			5.720			7.040			10.935			9.006			8.777			23.453			8.339			27.095			2.978			7.893
KB221	170.092		1.216			20.033			15.476			3.698			10.266			3.678			5.016			14.288			6.302			6.232			24.213			6.019			18.513			2.120			5.826
KB411	482.817		2.295			134.533			56.273			65.535			81.330			13.185			14.638			67.958			29.935			27.045			50.360			23.260			34.513			19.251			19.776
KB421	331.956		1.774			55.200			27.897			33.484			47.616			8.100			9.297			41.295			15.583			15.200			59.693			14.346			35.668			12.051			13.509
KB611	450.458		1.697			21.567			21.091			16.994			21.911			9.660			9.956			24.353			17.914			19.475			40.813			19.811			34.191			27.022			19.616
样品号	Zr	Hf		Sm			Eu			Ti			Gd			Tb			Dy			Y			Ho			Er			Tm			Yb			Lu			Sr/Y			La/Yb			Lu/Yb
KB111	6.434	5.825		7.892			7.191			4.357			6.460			5.630			5.098			4.963			4.821			4.644			4.265			4.429			4.376			7.66			3.61			0.15
KB211	4.234	4.040		6.616			6.097			3.255			5.544			4.855			4.392			3.661			4.086			3.831			3.388			3.371			3.129			34.25			3.93			0.14
KB221	2.399	2.675		5.202			5.108			3.371			4.467			4.097			3.825			3.235			3.659			3.505			3.215			3.222			3.046			26.48			2.87			0.14
KB411	13.078	10.551		14.010			10.594			6.496			10.088			8.208			7.077			6.070			6.566			6.265			5.750			5.828			5.641			26.31			7.55			0.15
KB421	7.056	6.266		10.916			9.273			8.269			8.430			6.998			6.027			4.981			5.564			5.169			4.521			4.433			4.113			33.14			5.17			0.14
KB611	5.378	5.455		16.074			12.440			9.316			12.460			10.046			8.582			6.926			7.832			7.155			6.074			5.810			5.212			22.85			4.53			0.14

样品号	SiO₂	TiO₂		Al₂O₃			TFe₂O₃			MgO			MnO			CaO			Na₂O			K₂O			P₂O₅			LOl			Mg^#			Na₂O/ K₂O			Na₂O+ K₂O			σ			A/CNK			A/NK
KB111	55.84	0.58		14.83			5.47			1.85			0.11			7.77			6.50			0.40			0.20			5.82			25.27			16.14			6.90			3.71			0.591			1.342
KB211	49.36	0.52		18.26			5.98			7.96			0.10			13.81			1.74			0.30			0.05			1.23			57.09			5.70			2.04			0.66			0.649			5.764
KB221	49.68	0.55		14.30			7.76			10.35			0.12			13.14			1.27			0.39			0.04			1.71			57.15			3.24			1.66			0.41			0.545			5.731
KB411	52.00	1.07		17.66			9.21			4.38			0.16			8.03			2.98			1.86			0.36			1.46			32.24			1.60			4.84			2.60			0.826			2.572
KB421	44.41	1.36		17.99			11.55			6.00			0.16			12.23			2.31			1.13			0.23			2.04			34.20			2.04			3.45			8.45			0.664			3.596
KB611	43.80	1.54		17.02			11.51			7.35			0.17			12.68			1.99			0.68			0.51			2.19			38.99			2.93			2.68			8.93			0.630			4.263
样品号	La	Ce			Pr			Nd			Sm			Eu			Gd			Tb			Dy			Ho			Er			Tm			Yb			Lu			LREE			HREE
KB111	29.755	28.722			26.737			24.775			20.941			19.093			17.100			14.904			13.528			12.693			12.290			11.373			11.489			11.630			150.024			105.006
KB211	24.624	24.023			22.295			21.126			17.556			16.190			14.676			12.850			11.654			10.756			10.138			9.035			8.746			8.315			125.814			86.170
KB221	17.232	17.056			16.093			15.593			13.804			13.562			11.825			10.845			10.150			9.633			9.275			8.573			8.359			8.094			93.339			76.753
KB411	81.848	74.020			62.189			52.934			37.176			28.128			26.706			21.727			18.780			17.286			16.580			15.333			15.118			14.992			336.295			146.522
KB421	42.608	41.601			38.358			36.158			28.967			24.621			22.316			18.524			15.992			14.647			13.680			12.055			11.500			10.929			212.313			119.643
KB611	48.979	53.301			52.968			52.505			42.654			33.031			32.983			26.594			22.772			20.618			18.937			16.196			15.071			13.850			283.438			167.020
样品号	ΣREE		LREE/ HREE			Rb			Ba			Th			U			Nb			Ta			K			La			Ce			Pb			Pr			Sr			P			Nd
KB111	255.029		1.428			20.953			6.148			12.400			23.034			6.100			6.476			19.275			10.883			10.494			17.987			10.000			8.216			15.484			9.256
KB211	211.984		1.46			10.313			19.582			7.286			16.167			5.720			7.040			10.935			9.006			8.777			23.453			8.339			27.095			2.978			7.893
KB221	170.092		1.216			20.033			15.476			3.698			10.266			3.678			5.016			14.288			6.302			6.232			24.213			6.019			18.513			2.120			5.826
KB411	482.817		2.295			134.533			56.273			65.535			81.330			13.185			14.638			67.958			29.935			27.045			50.360			23.260			34.513			19.251			19.776
KB421	331.956		1.774			55.200			27.897			33.484			47.616			8.100			9.297			41.295			15.583			15.200			59.693			14.346			35.668			12.051			13.509
KB611	450.458		1.697			21.567			21.091			16.994			21.911			9.660			9.956			24.353			17.914			19.475			40.813			19.811			34.191			27.022			19.616
样品号	Zr	Hf		Sm			Eu			Ti			Gd			Tb			Dy			Y			Ho			Er			Tm			Yb			Lu			Sr/Y			La/Yb			Lu/Yb
KB111	6.434	5.825		7.892			7.191			4.357			6.460			5.630			5.098			4.963			4.821			4.644			4.265			4.429			4.376			7.66			3.61			0.15
KB211	4.234	4.040		6.616			6.097			3.255			5.544			4.855			4.392			3.661			4.086			3.831			3.388			3.371			3.129			34.25			3.93			0.14
KB221	2.399	2.675		5.202			5.108			3.371			4.467			4.097			3.825			3.235			3.659			3.505			3.215			3.222			3.046			26.48			2.87			0.14
KB411	13.078	10.551		14.010			10.594			6.496			10.088			8.208			7.077			6.070			6.566			6.265			5.750			5.828			5.641			26.31			7.55			0.15
KB421	7.056	6.266		10.916			9.273			8.269			8.430			6.998			6.027			4.981			5.564			5.169			4.521			4.433			4.113			33.14			5.17			0.14
KB611	5.378	5.455		16.074			12.440			9.316			12.460			10.046			8.582			6.926			7.832			7.155			6.074			5.810			5.212			22.85			4.53			0.14

样品号	Rb/(μg/g)	Sr/(μg/g)	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/⁸⁶Sr ±2σ	(⁸⁷Sr/ ⁸⁶Sr)_i	¹⁴³Nd/ ¹⁴⁴Nd	¹⁴⁷Sm/ ¹⁴⁴Nd	(¹⁴³Nd/ ¹⁴⁴Nd)_i	ε_Nd(0)	ε_Nd(_t₎	T_DM /Ma
KB2-2-1	12.02	368.40	0.095 6	0.709 4±0.000 005	0.709	0.512 5	0.018 4	0.513	-1.06	7.45	449
KB2-1-1	6.19	539.20	0.033 6	0.705 8±0.000 004	0.706	0.512 6	0.013 0	0.513	-0.57	8.21	418
KB6-1-1	12.94	680.40	0.055 7	0.706 4±0.000 005	0.706	0.512 5	0.009 9	0.512	-2.08	6.84	469
KB4-1-1	80.72	686.80	0.344 6	0.707 6±0.000 004	0.706	0.512 5	0.008 0	0.513	-1.90	7.11	458
KB4-2-1	33.12	709.80	0.136 8	0.706 8±0.000 005	0.706	0.512 6	0.005 7	0.513	0.64	9.76	358

样品号	Rb/(μg/g)	Sr/(μg/g)	⁸⁷Rb/ ⁸⁶Sr	⁸⁷Sr/⁸⁶Sr ±2σ	(⁸⁷Sr/ ⁸⁶Sr)_i	¹⁴³Nd/ ¹⁴⁴Nd	¹⁴⁷Sm/ ¹⁴⁴Nd	(¹⁴³Nd/ ¹⁴⁴Nd)_i	ε_Nd(0)	ε_Nd(_t₎	T_DM /Ma
KB2-2-1	12.02	368.40	0.095 6	0.709 4±0.000 005	0.709	0.512 5	0.018 4	0.513	-1.06	7.45	449
KB2-1-1	6.19	539.20	0.033 6	0.705 8±0.000 004	0.706	0.512 6	0.013 0	0.513	-0.57	8.21	418
KB6-1-1	12.94	680.40	0.055 7	0.706 4±0.000 005	0.706	0.512 5	0.009 9	0.512	-2.08	6.84	469
KB4-1-1	80.72	686.80	0.344 6	0.707 6±0.000 004	0.706	0.512 5	0.008 0	0.513	-1.90	7.11	458
KB4-2-1	33.12	709.80	0.136 8	0.706 8±0.000 005	0.706	0.512 6	0.005 7	0.513	0.64	9.76	358

样品号	Pb/(μg/g)	Th/(μg/g)	U/(μg/g)	²⁰⁶Pb/²⁰⁴Pb	²⁰⁷Pb/²⁰⁴Pb	²⁰⁸Pb/²⁰⁴Pb	(²⁰⁶Pb/²⁰⁴Pb)_i	(²⁰⁷Pb/²⁰⁴Pb)_i	(²⁰⁸Pb/²⁰⁴Pb)_i
KB2-2-1	3.63	0.29	0.21	18.478 3	15.604 4	38.315 4	18.235	15.591	38.207
KB2-1-1	3.52	0.58	0.33	18.474 2	15.601 1	38.257 5	18.078	15.580	38.037
KB6-1-1	6.12	1.35	0.44	18.547 9	15.607 3	38.399 2	18.239	15.591	38.104
KB4-1-1	7.55	5.21	1.65	18.943 4	15.623 7	38.793 1	18.015	15.573	37.871
KB4-2-1	8.95	2.66	0.97	18.669 4	15.617 4	38.482 8	18.211	15.593	38.085