Apatite U-Pb Geochronology of the Trachy Dacite in Mashan Area, Jiaolai Basin, North China Craton, and Its Geological Significance

doi:10.19657/j.geoscience.1000-8527.2023.053

Abstract

Abstract:

The Wulian-Qingdao-Yantai fault (WQYF) is one of the most important basin-controlling faults in the Jiaolai basin, where the fault dominates the formation and evolution of the basin.This fault is mainly composed of abundant NNE faults, such as Muping-Jimo fault and Taocun fault.The WQYF experienced sinistral strike-slip movement in Late Jurassic, extensional rift in Early Cretaceous, and dextral strike-slip movement during Late Cretaceous-Paleocene.However, the most key question that the duration of the Cenozoic dextral strike-slip movement still remains unclear.Previous studies suggested that temperature of strike-slip movement in this region is about 550-650 ℃, which is higher than the closure temperature, 350-550 ℃, of the apatite U-Pb system.Therefore, in this case apatite can be an ideal candidate to investigate the dextral strike-slip of the WQYF.In this study, we conducted U-Pb dating of apatite from the Early Cretaceous trachy-dacite in the Mashan area and obtained the U-Pb age of 64.1±3.7 Ma.The measured magmatic age of apatite is different from the crystallization age of the Mashan trachy-dacite, indicating that at least there was one geothermal event which reset the apatite U-Pb isotope system in Early Paleocene.Since Early Cretaceous, the collision between the Indian plate and Eurasian plate, and the switch of subduction direction of the paleo-Pacific plate from NWW to NW result in a north-south extension of the Jiaolai basin and the dextral strike-slip of the Muping-Jimo fault.Therefore, we propose that the apatite U-Pb age of the Mashan trachy-dacite documented the dextral strike-slip thermal event of the WQYF, and indicates that the dextral strike-slip may continue until Paleocene.

Key words: apatite U-Pb geochronology, trachy-dacite, Wulian-Qingdao-Yantai fault, Paleocene dextral strike-slip

CLC Number:

P597

ZHU Tuo, HE Dengyang, HUANG Yaqi, QIU Kunfeng. Apatite U-Pb Geochronology of the Trachy Dacite in Mashan Area, Jiaolai Basin, North China Craton, and Its Geological Significance[J]. Geoscience, 2024, 38(01): 117-127.

Figures/Tables 7

References 69

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测点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb			²⁰⁶Pb/²³⁸U			测点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁶Pb/²³⁸U
测点号	(10^-6)		Th/U	比值	1σ		比值		1σ	测点号	(10^-6)		Th/U	比值	1σ	比值	1σ
17MS01.2	1270	1181	1.08	0.5207	3.0654	49.087		1.8747		17MS01.35	464	472	0.98	0.8951	1.4044	1.3221	1.8974
17MS01.3	6878	249	27.66	0.891	1.2942	3.0512		4.23195		17MS01.37	123	25	4.93	0.5263	4.0704	39.6814	2.5101
17MS01.5	61	7	8.57	0.8688	1.2268	2.5613		1.1505		17MS01.38	1362	136	10.01	0.8535	1.3220	2.5465	4.5574
17MS01.6	1644	187	8.81	0.8868	1.3172	2.5214		1.7101		17MS01.39	56	16	3.37	0.8497	1.0897	2.7783	1.1734
17MS01.7	106	22	4.88	0.8586	1.2233	4.5204		1.2678		17MS01.40	5	17	0.28	0.8740	1.2181	1.0480	1.9597
17MS01.8	86	13	6.91	0.8760	1.1689	2.4897		1.3219		17MS01.42	196	30	6.50	0.8243	2.5830	0.6932	4.8606
17MS01.9	79	16	5.09	0.9095	1.1094	1.2497		2.1105		17MS01.43	59	7	8.42	0.9094	0.8948	0.1111	11.2151
17MS01.10	76	14	5.30	0.8834	1.5750	2.9378		1.5872		17MS01.44	192	52	3.69	0.5016	2.0304	44.7253	1.9601
17MS01.12	94	14	6.60	0.8743	1.4404	1.9390		1.5487		17MS01.45	1391	1995	0.70	0.6291	3.7503	30.8625	2.4905
17MS01.13	463	462	1.00	0.8804	1.3690	1.6412		1.3879		17MS01.46	1274	1874	0.68	0.5888	3.5811	35.6714	2.1179
17MS01.14	453	461	0.98	0.4845	3.3717	45.5478		2.3638		17MS01.47	6466	381	16.96	0.9039	1.4358	2.2080	3.0184
17MS01.16	155	16	9.97	0.8527	2.0586	0.5450		8.0893		17MS01.49	15	2	8.38	0.8546	1.0487	1.7677	1.4732
17MS01.17	70	7	9.93	0.8753	1.0525	2.1948		2.5031		17MS01.50	95	33	2.89	0.8817	1.0195	1.6856	1.9057
17MS01.18	46	12	3.89	0.9082	1.0402	2.0720		1.9266		17MS01.52	1	2	0.60	0.8931	1.1777	2.4336	1.4093
17MS01.20	1277	170	7.51	0.8974	0.9356	1.8199		2.3891		17MS01.53	663	253	2.62	0.8999	1.3397	2.9198	1.4218
17MS01.22	4	5	0.86	0.8559	1.0636	2.0625		1.1626		17MS01.56	45	15	3.13	0.8644	1.6027	2.6286	1.5413
17MS01.23	1316	1104	1.19	0.5093	2.3223	55.2046		1.8992		17MS01.57	462	467	0.99	0.8634	1.3099	4.1745	1.4078
17MS01.25	1583	70	22.75	0.8505	1.1378	2.6453		1.5710		17MS01.59	556	197	2.82	0.7957	3.2110	6.1032	2.3855
17MS01.27	122	19	6.25	0.8714	1.2965	1.7653		1.6522		17MS01.60	0	7	0.06	0.4696	3.8509	41.6457	2.0471
17MS01.28	118	19	6.24	0.8385	1.1699	1.6493		1.4157		17MS01.61	17	7	2.62	0.9328	1.2852	0.8348	2.5080
17MS01.31	2	1	1.86	0.9170	1.5418	0.7938		2.6302		17MS01.62	1801	509	3.54	0.9005	1.7886	2.2449	5.1810
17MS01.32	107	19	5.57	0.8156	1.2677	4.6167		1.3848		17MS01.63	851	210	4.05	0.4586	2.7958	56.5846	1.8309
17MS01.34	207	12	17.27	0.8531	1.3984	2.5556		1.3361

测点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb			²⁰⁶Pb/²³⁸U			测点号	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb		²⁰⁶Pb/²³⁸U
测点号	(10^-6)		Th/U	比值	1σ		比值		1σ	测点号	(10^-6)		Th/U	比值	1σ	比值	1σ
17MS01.2	1270	1181	1.08	0.5207	3.0654	49.087		1.8747		17MS01.35	464	472	0.98	0.8951	1.4044	1.3221	1.8974
17MS01.3	6878	249	27.66	0.891	1.2942	3.0512		4.23195		17MS01.37	123	25	4.93	0.5263	4.0704	39.6814	2.5101
17MS01.5	61	7	8.57	0.8688	1.2268	2.5613		1.1505		17MS01.38	1362	136	10.01	0.8535	1.3220	2.5465	4.5574
17MS01.6	1644	187	8.81	0.8868	1.3172	2.5214		1.7101		17MS01.39	56	16	3.37	0.8497	1.0897	2.7783	1.1734
17MS01.7	106	22	4.88	0.8586	1.2233	4.5204		1.2678		17MS01.40	5	17	0.28	0.8740	1.2181	1.0480	1.9597
17MS01.8	86	13	6.91	0.8760	1.1689	2.4897		1.3219		17MS01.42	196	30	6.50	0.8243	2.5830	0.6932	4.8606
17MS01.9	79	16	5.09	0.9095	1.1094	1.2497		2.1105		17MS01.43	59	7	8.42	0.9094	0.8948	0.1111	11.2151
17MS01.10	76	14	5.30	0.8834	1.5750	2.9378		1.5872		17MS01.44	192	52	3.69	0.5016	2.0304	44.7253	1.9601
17MS01.12	94	14	6.60	0.8743	1.4404	1.9390		1.5487		17MS01.45	1391	1995	0.70	0.6291	3.7503	30.8625	2.4905
17MS01.13	463	462	1.00	0.8804	1.3690	1.6412		1.3879		17MS01.46	1274	1874	0.68	0.5888	3.5811	35.6714	2.1179
17MS01.14	453	461	0.98	0.4845	3.3717	45.5478		2.3638		17MS01.47	6466	381	16.96	0.9039	1.4358	2.2080	3.0184
17MS01.16	155	16	9.97	0.8527	2.0586	0.5450		8.0893		17MS01.49	15	2	8.38	0.8546	1.0487	1.7677	1.4732
17MS01.17	70	7	9.93	0.8753	1.0525	2.1948		2.5031		17MS01.50	95	33	2.89	0.8817	1.0195	1.6856	1.9057
17MS01.18	46	12	3.89	0.9082	1.0402	2.0720		1.9266		17MS01.52	1	2	0.60	0.8931	1.1777	2.4336	1.4093
17MS01.20	1277	170	7.51	0.8974	0.9356	1.8199		2.3891		17MS01.53	663	253	2.62	0.8999	1.3397	2.9198	1.4218
17MS01.22	4	5	0.86	0.8559	1.0636	2.0625		1.1626		17MS01.56	45	15	3.13	0.8644	1.6027	2.6286	1.5413
17MS01.23	1316	1104	1.19	0.5093	2.3223	55.2046		1.8992		17MS01.57	462	467	0.99	0.8634	1.3099	4.1745	1.4078
17MS01.25	1583	70	22.75	0.8505	1.1378	2.6453		1.5710		17MS01.59	556	197	2.82	0.7957	3.2110	6.1032	2.3855
17MS01.27	122	19	6.25	0.8714	1.2965	1.7653		1.6522		17MS01.60	0	7	0.06	0.4696	3.8509	41.6457	2.0471
17MS01.28	118	19	6.24	0.8385	1.1699	1.6493		1.4157		17MS01.61	17	7	2.62	0.9328	1.2852	0.8348	2.5080
17MS01.31	2	1	1.86	0.9170	1.5418	0.7938		2.6302		17MS01.62	1801	509	3.54	0.9005	1.7886	2.2449	5.1810
17MS01.32	107	19	5.57	0.8156	1.2677	4.6167		1.3848		17MS01.63	851	210	4.05	0.4586	2.7958	56.5846	1.8309
17MS01.34	207	12	17.27	0.8531	1.3984	2.5556		1.3361

年代		区内构造活动	区内岩浆活动
古新世	晚期	胶莱盆地萎缩五莲—青岛—烟台断裂右旋挤压走滑
古新世	早期	胶莱盆地N—S向拉分五莲—青岛—烟台断裂右旋伸展走滑
晚白垩世	晚期	胶莱盆地NW—SE向伸展五莲—青岛—烟台断裂右旋伸展走滑	莒南火山角砾岩((66.8±1.5) Ma)^[50] 胶州玄武岩(72 Ma)^[51] 诸城玄武岩(76 Ma)^[51] 青岛基性脉岩((86.0±1.6) Ma)^[50]
晚白垩世	早期	胶莱盆地NW—SE向伸展五莲—青岛—烟台断裂右旋伸展走滑
早白垩世	中晚期	胶莱盆地早白垩世E—W向拉分五莲—青岛—烟台断裂E—W向伸展	分岭山安粗岩((110.4±1.7) Ma)^[52] 海阳安山质熔岩((118.06±3.22) Ma)^[29] 马山粗面英安岩((119.3±1.6) Ma)^[4] 七宝山次火山岩((126±3) Ma)^[46]
早白垩世	早期	胶莱盆地早白垩世E—W向拉分五莲—青岛—烟台断裂NW—SE向伸展
晚侏罗世	早期	胶莱盆地拉分五莲—青岛—烟台断裂左旋走滑	昆嵛山花岗闪长岩(147 Ma)^[46] 昆嵛山二长闪长岩((152.2±1.2) Ma)^[44] 鹊山二长花岗岩((154.0±1.2) Ma)^[44] 玲珑花岗闪长岩((153±4) Ma)^[42]
晚侏罗世	晚期	胶莱盆地拉分五莲—青岛—烟台断裂左旋走滑	鹊山石英二长岩((156.3±1.8) Ma)^[44] 文登二长花岗岩((157±5) Ma)^[43] 玲珑二长花岗岩((160±3) Ma)^[42] 玲珑金矿二长花岗岩((164±2) Ma)^[45]

年代		区内构造活动	区内岩浆活动
古新世	晚期	胶莱盆地萎缩五莲—青岛—烟台断裂右旋挤压走滑
古新世	早期	胶莱盆地N—S向拉分五莲—青岛—烟台断裂右旋伸展走滑
晚白垩世	晚期	胶莱盆地NW—SE向伸展五莲—青岛—烟台断裂右旋伸展走滑	莒南火山角砾岩((66.8±1.5) Ma)^[50] 胶州玄武岩(72 Ma)^[51] 诸城玄武岩(76 Ma)^[51] 青岛基性脉岩((86.0±1.6) Ma)^[50]
晚白垩世	早期	胶莱盆地NW—SE向伸展五莲—青岛—烟台断裂右旋伸展走滑
早白垩世	中晚期	胶莱盆地早白垩世E—W向拉分五莲—青岛—烟台断裂E—W向伸展	分岭山安粗岩((110.4±1.7) Ma)^[52] 海阳安山质熔岩((118.06±3.22) Ma)^[29] 马山粗面英安岩((119.3±1.6) Ma)^[4] 七宝山次火山岩((126±3) Ma)^[46]
早白垩世	早期	胶莱盆地早白垩世E—W向拉分五莲—青岛—烟台断裂NW—SE向伸展
晚侏罗世	早期	胶莱盆地拉分五莲—青岛—烟台断裂左旋走滑	昆嵛山花岗闪长岩(147 Ma)^[46] 昆嵛山二长闪长岩((152.2±1.2) Ma)^[44] 鹊山二长花岗岩((154.0±1.2) Ma)^[44] 玲珑花岗闪长岩((153±4) Ma)^[42]
晚侏罗世	晚期	胶莱盆地拉分五莲—青岛—烟台断裂左旋走滑	鹊山石英二长岩((156.3±1.8) Ma)^[44] 文登二长花岗岩((157±5) Ma)^[43] 玲珑二长花岗岩((160±3) Ma)^[42] 玲珑金矿二长花岗岩((164±2) Ma)^[45]