青海省天峻县阳康地区花岗岩岩体锆石U-Pb年代学及地球化学特征研究

doi:10.11720/wtyht.2021.1185

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Abstract

The formation age and petrogenesis of the Yangkang granites in the Qilian block remain controversial. In this study, LA-ICP-MS zircon U-Pb dating and whole-rock geochemical analysis were conducted to constrain the petrogenetic and tectonic processes during the formation of the granites. The results show that U-Pb age of granodiorite in Yangkang pluton is 444±1.2Ma, (MSWD=1.14), indicating that it was formed in the early Late Ordovician and that the rocks belong to weak peraluminous-strong peraluminous I-type granite.The rocks are enriched with large ion lithophile elements (K,Ba, Rb) and Light Rare Earth Elements (LREEs) and Th, but depleted in the high field strength elements (e.g., Ta-Nb). The above results show that Yangkang granites were derived from partial melting of continental crust. Combined with the regional data, the authors suggest that the Yangkang granites were probably formed in an active continental margin during Late Ordovician.

Key words： late Ordovician zircon U-Pb dating rock geochemistry Yangkang granite south Qilian block

Received: 19 April 2020 Published: 21 December 2021

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	Yong-Kun FANG
	Cheng-Gang Cao
	Jun-Lin DONG
	Ling-Gui LI

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Yong-Kun FANG,Cheng-Gang Cao,Jun-Lin DONG, et al. Geochronology and geochemistry of the granodiorite intrusion in Yangkang area of Qinghai Province and its geological significance[J]. Geophysical and Geochemical Exploration, 2021, 45(6): 1367-1377.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1185 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I6/1367

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Geological sketch map of the studied area(revised according to reference [19])

An image of granodiorite travertine in Yangkang area

样品号	含量/10^-6		同位素比值										年龄/Ma
样品号	Pb	U	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶U	1σ	²⁰⁸Pb/²³²U	1σ	²³²Pb/²³⁸U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁷Pb/²⁰⁶U	1σ
1	63	638	0.0707	0.0004	0.5532	0.0097	0.0568	0.0010	0.0226	0.0004	1.6932	0.0068	440	3	447	8	482	38
2	48	628	0.0707	0.0004	0.5410	0.0090	0.0555	0.0009	0.0235	0.0007	0.6166	0.0015	440	3	439	7	432	36
3	78	920	0.0710	0.0004	0.5520	0.0077	0.0564	0.0008	0.0240	0.0010	0.9622	0.0009	442	2	446	6	468	31
5	23	235	0.0721	0.0006	0.5671	0.0315	0.0571	0.0032	0.0277	0.0018	1.3363	0.0021	449	4	456	25	495	122
7	21	247	0.0713	0.0005	0.5598	0.0333	0.0569	0.0034	0.0330	0.0028	0.6607	0.0042	444	3	451	27	489	132
8	44	515	0.0706	0.0005	0.5488	0.0134	0.0564	0.0013	0.0355	0.0033	0.6807	0.0014	440	3	444	11	467	51
9	27	315	0.0719	0.0004	0.5660	0.0186	0.0571	0.0019	0.0310	0.0029	0.7146	0.0032	448	3	455	15	494	72
10	18	201	0.0720	0.0005	0.5630	0.0280	0.0567	0.0028	0.0290	0.0026	0.8715	0.0019	448	3	453	23	482	109
11	14	167	0.0718	0.0005	0.5527	0.0353	0.0559	0.0035	0.0300	0.0025	0.6928	0.0006	447	3	447	29	447	140
13	20	232	0.0719	0.0005	0.5566	0.0259	0.0561	0.0026	0.0234	0.0015	1.0709	0.0039	448	3	449	21	458	102
15	21	258	0.0713	0.0004	0.5546	0.0192	0.0564	0.0020	0.0219	0.0011	0.8837	0.0045	444	3	448	16	470	77
16	14	182	0.0716	0.0005	0.5564	0.0243	0.0564	0.0024	0.0201	0.0010	0.6374	0.0030	446	3	449	20	468	95
17	37	534	0.0712	0.0004	0.5471	0.0108	0.0557	0.0011	0.0182	0.0009	0.3169	0.0017	443	3	443	9	442	43
20	21	318	0.0718	0.0004	0.5666	0.0210	0.0572	0.0021	0.0201	0.0008	0.0628	0.0003	447	3	456	17	499	82
23	15	184	0.0708	0.0004	0.5558	0.0207	0.0569	0.0021	0.0201	0.0008	0.8942	0.0039	441	3	449	17	489	81
24	32	436	0.0717	0.0004	0.5524	0.0121	0.0559	0.0012	0.0180	0.0007	0.4893	0.0004	447	2	447	10	447	48
26	17	211	0.0714	0.0004	0.5634	0.0191	0.0572	0.0019	0.0192	0.0009	0.8418	0.0031	445	3	454	15	499	73
30	18	244	0.0712	0.0004	0.5579	0.0207	0.0568	0.0021	0.0205	0.0011	0.4750	0.0007	443	3	450	17	485	81

Isotopic dating results of granodiorite in Yangkang area

Zircon U-Pb concordia diagram (a) and weighted average ages diagram (b) from the granodiorite

Major, REE and trace element content and parameter of the granodiorite in Yangkang

Diagram of TAS rock classification in Yangkang area

Diagram of w(SiO₂)-w(K₂O)(a) and ANK-A/CNK(b)

Chondrite-normalized REE patterns (a) and primitive mantle-normalized spider diagram of trace elements (b)for the Yangkang granites

Diagram of w(La)/w(Sm)-w(La)

Diagram of w(Nb)-w(Y)(a) and w(Rb)-[w(Y)+w(Nb)](b)

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