贵州省黔西县官坝地区二叠系-三叠系地质界面碳、氧同位素特征及意义

doi:10.11720/wtyht.2018.0121

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Abstract

This study focuses on the C and O isotope signature for the rocks from the Permian?Triassic boundary in Guanba area of Qianxi, Guizhou Province. The result reveals that δ13C has a distinct negative drift,and the δ18O drops abruptly. Three layers of tuff,recognized at the boundary,have recorded the volcanic events that occurred in late Permian to early Triassic in this area . The volcanic events led to the abrupt change of sedimentary environments and ultimately triggered the mass extinction during the end of Permian.

Key words： Permian-Triassic boundary Guanba area of Qianxi C and O isotopes tuff

Received: 23 March 2018 Published: 24 October 2018

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	Bin YANG
	Fei ZHAO
	Bi HE
	Ning-Zu WANG
	Wen-Bin ZHANG
	Zhi-Xi ZHANG
	Wei LI

Cite this article:

Bin YANG,Fei ZHAO,Bi HE, et al. Carbon and oxygen isotope geochemistry of the Permian-Triassic boundary in Guanba area of Qianxi,Guizhou Province, and its significance[J]. Geophysical and Geochemical Exploration, 2018, 42(5): 1081-1088.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2018.0121 OR https://www.wutanyuhuatan.com/EN/Y2018/V42/I5/1081

样品编号	PM315-DH5	PM315-DH6	PM315-DH7	PM315-DH9	PM315-DH10	PM315-DH11	PM315-DH13
SiO₂	55.78	56.65	56.12	78.45	79.89	52.11	56.12
TiO₂	0.27	0.28	0.26	0.27	0.27	0.43	0.45
Al₂O₃	22.85	22.74	22.88	11.12	10.18	25.65	22.64
Fe₂O₃	1.03	0.94	0.90	1.03	0.74	1.36	1.96
FeO	0.09	0.09	0.13	0.40	0.45	0.40	0.40
MnO	0.009	0.010	0.008	0.006	0.012	0.008	0.031
MgO	3.06	3.02	3.02	1.15	1.15	3.08	2.45
CaO	1.03	0.59	0.74	0.25	0.37	0.32	0.56
Na₂O	0.55	0.51	0.85	0.27	0.33	0.48	0.42
K₂O	6.68	6.72	6.65	3.16	2.92	7.07	6.24
P₂O₅	0.096	0.066	0.071	0.039	0.085	0.091	0.10
烧失量	8.52	8.32	8.30	3.78	3.56	8.96	8.56
总量	99.97	99.94	99.93	99.93	99.96	99.96	99.93
w(SiO₂)/w(Al₂O₃)	2.44	2.49	2.45	7.05	7.85	2.03	2.48
w(TiO₂)/w(Al₂O₃)	0.012	0.012	0.011	0.024	0.027	0.017	0.020
Rb	226.000	217.800	220.500	91.200	95.400	245.700	191.70
Ba	265.00	283.88	278.63	138.25	150.00	298.00	294.63
Th	52.30	56.30	52.90	27.76	22.52	61.46	47.14
U	13.80	13.09	12.75	6.28	4.52	8.93	4.00
Ta	3.96	4.56	4.30	1.74	1.68	3.46	3.02
Nb	40.300	41.600	39.312	17.971	13.800	28.220	21.200
Sr	35.20	26.46	22.37	35.93	28.58	27.60	34.20
Zr	318.00	317.84	300.44	265.64	231.30	371.90	377.46
Hf	10.84	10.52	10.35	7.26	6.42	13.31	12.75
Co	3.91	5.18	5.50	3.32	4.96	15.56	13.27
Ni	9.52	8.89	8.88	4.63	6.07	17.20	23.00
Ga	28.60	28.28	28.70	13.02	12.67	29.05	24.29
Pb	38.60	37.20	38.22	20.44	29.60	27.89	26.55
Cr	5.21	5.21	5.37	4.98	7.97	7.23	14.08
Sc	17.60	17.60	17.93	9.52	8.36	22.77	23.10
La	135.60	132.00	106.20	56.30	40.92	130.80	114.84
Ce	212.06	217.67	185.13	105.58	77.08	243.47	231.13
Pr	31.20	29.18	23.20	12.08	8.61	28.46	27.27
Nd	108.903	110.128	87.833	44.200	31.483	103.513	105.963
Sm	22.60	23.70	18.90	8.11	6.33	17.50	19.90
Eu	1.420	1.320	1.147	1.059	0.946	1.835	2.60
Gd	20.20	18.16	17.11	7.23	6.46	14.04	16.05
Tb	3.82	3.34	3.49	1.32	1.28	2.25	2.68
Dy	24.23	21.60	23.05	8.20	7.99	12.11	15.05
Ho	5.41	4.73	5.30	1.87	1.73	2.56	3.20
Er	16.70	14.28	16.47	5.76	5.10	7.57	9.11
Tm	2.78	2.51	2.71	0.96	0.85	1.27	1.41
Yb	18.60	15.79	17.26	6.36	5.32	8.12	8.60
Lu	2.57	2.27	2.46	0.94	0.77	1.14	1.21
Y	163.00	134.60	155.25	48.60	48.50	68.58	101.93
ΣREE	606.09	596.68	510.26	259.97	194.87	574.64	559.01
LREE	511.78	514.00	422.41	227.33	165.37	525.58	501.70
HREE	94.31	82.68	87.85	32.64	29.50	49.06	57.31
w(LREE)/w(HREE)	5.43	6.22	4.81	6.96	5.61	10.71	8.75
δEu	0.20	0.19	0.19	0.41	0.45	0.35	0.43
δCe	0.77	0.82	0.87	0.95	0.96	0.93	0.98
La_N/Yb_N	5.23	6.00	4.41	6.35	5.52	11.55	9.58

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