Discussion on the features and mechanism of cryptoexplosive breccia in Wu’an, Hebei Province

doi:10.13745/j.esf.sf.2020.11.29

Abstract

Abstract:

Cryptoexplosive breccia is widely distributed in Wu’an, Hebei Province. The study of its forming process of is important to the understandings of the interaction between magma and fluid and the formation of Fe deposit. We carried out in situ mineralogical analysis by electron microprobe analysis (EMPA) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) in combination with detailed field and microscope investigation. The results show that the Wu’an breccia is mainly distributed between the Hongshan intrusive complex (mainly diorite) and its host rock (limestone). The gravels are mostly angular or subangular-shaped and could be easily pieced together. Secondary enlargement of calcite is often seen on the edge of the angular gravels of different colors due to different Fe contents. The matrix of breccia is mainly composed of calcite and hematite. A composition zone can be observed in hematite, which has higher FeO content in the core and higher MgO and Al₂O₃ contents in the edge. The total iron is negatively correlated with SiO₂ content. The trace elemental characteristics of hematite show enrichments of Ba, K and U and depletions of high field-strength elements, such as Th, Ta, Nb, Zr and Hf, which may indicate that the magma was formed in a magma-fluid environment. The core hematite zone is enriched in Ti and Pb. The enrichment of Ti indicates the hematite’s magmatic origin, while the enrichment of Pb indicates a later involvement of hydrofluid superposition. According to this study, the genetic model of the cryptoexplosive breccia in the Wu’an area is as follows: The trapping of rising deep magmatic fluid by overlying host rock resulted in boiling and overpressure of the fluid, which led to cryptoexplosion as the overlying rock strata suddenly decompressed and broke up and the magmatic fluid cemented the upper rock mass into rocks.

Key words: Wu’an City in Hebei Province;, cryptoexplosive breccia, magmatic hydrothermal fluid, hematite

CLC Number:

LI Ruipeng, CUI Xiaoliang, SU Shangguo, ZHANG Yanan, LIANG Cuntao, CHEN Xuegen. Discussion on the features and mechanism of cryptoexplosive breccia in Wu’an, Hebei Province[J]. Earth Science Frontiers, 2021, 28(1): 353-362.

Figures/Tables 11

References 43

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样品号	w_B/%
样品号	SiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	Total
4b4-2-4	0.05	0.03	0.61	0.08	0.24	51.76	0.05	0.02	52.84
4b4-2-5	0.00	0.01	0.07	0.00	0.36	53.19	0.02	0.00	53.89
4b4-2-6	0.05	0.03	0.15	0.03	0.25	52.75	0.00	0.00	53.28
4b5-3-4	0.06	0.03	0.18	0.00	0.35	53.32	0.02	0.00	53.96
4b5-3-5	0.26	0.09	0.20	0.00	0.38	52.78	0.02	0.04	53.77
4b4-4-4	0.04	0.00	0.12	0.02	0.15	53.26	0.02	0.02	53.62
4b4-4-5	0.02	0.00	0.00	0.01	0.37	54.59	0.04	0.00	55.03
4b4-4-6	0.02	0.02	0.01	0.00	0.22	54.44	0.04	0.00	54.89
4b4-5-4	0.55	0.42	0.28	0.03	0.19	53.15	0.06	0.00	54.68
L1-3-1	0.07	0.00	0.00	0.04	0.12	55.39	0.00	0.01	55.62
L1-3-2	0.06	0.00	0.00	0.00	0.05	53.84	0.01	0.01	53.97
L1-4-1	0.01	0.01	0.05	0.11	0.09	54.81	0.06	0.00	55.13
L1-4-2	0.02	0.00	0.03	0.00	0.09	54.07	0.13	0.03	54.38
L2-1-1	0.62	0.55	0.05	0.00	0.49	54.50	0.07	0.01	56.39
L2-1-2	0.08	0.04	0.00	0.00	0.06	53.95	0.06	0.01	54.23
L2-1-3	0.02	0.00	0.00	0.01	0.35	53.94	0.00	0.00	54.46
L2-2-1	0.04	0.01	0.03	0.02	0.15	57.13	0.03	0.02	57.43
L2-2-2	0.01	0.00	0.03	0.00	0.07	54.76	0.00	0.00	54.87
L2-2-3	0.05	0.00	0.23	0.00	0.12	56.35	0.04	0.03	56.83
L2-4-1	0.02	0.00	0.00	0.06	0.04	54.78	0.00	0.00	54.91
L2-4-2	0.05	0.00	0.06	0.01	0.23	57.58	0.00	0.00	57.93
L2-4-3	0.10	0.04	1.16	0.04	0.12	54.20	0.23	0.04	55.94
L3-5-1	0.08	0.04	0.02	0.00	0.10	54.83	0.07	0.01	55.18
L3-5-2	0.23	0.17	0.02	0.03	0.35	55.22	0.20	0.04	56.29
L3-5-3	0.26	0.10	0.57	0.13	0.66	57.20	0.24	0.08	59.46
L3-4-1	0.08	0.04	0.32	0.04	0.17	54.96	0.00	0.02	55.65
L3-4-2	0.01	0.01	0.01	0.01	0.35	55.55	0.04	0.00	56.12
L3-4-3	0.36	0.19	0.22	0.01	0.08	57.68	0.06	0.04	58.66
L2-9-3	0.12	0.09	0.00	0.01	0.10	56.57	0.07	0.01	57.03
L2-9-4	0.17	0.08	0.02	0.03	0.06	55.87	0.04	0.01	56.30

样品号	w_B/%
样品号	SiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	Total
4b4-2-4	0.05	0.03	0.61	0.08	0.24	51.76	0.05	0.02	52.84
4b4-2-5	0.00	0.01	0.07	0.00	0.36	53.19	0.02	0.00	53.89
4b4-2-6	0.05	0.03	0.15	0.03	0.25	52.75	0.00	0.00	53.28
4b5-3-4	0.06	0.03	0.18	0.00	0.35	53.32	0.02	0.00	53.96
4b5-3-5	0.26	0.09	0.20	0.00	0.38	52.78	0.02	0.04	53.77
4b4-4-4	0.04	0.00	0.12	0.02	0.15	53.26	0.02	0.02	53.62
4b4-4-5	0.02	0.00	0.00	0.01	0.37	54.59	0.04	0.00	55.03
4b4-4-6	0.02	0.02	0.01	0.00	0.22	54.44	0.04	0.00	54.89
4b4-5-4	0.55	0.42	0.28	0.03	0.19	53.15	0.06	0.00	54.68
L1-3-1	0.07	0.00	0.00	0.04	0.12	55.39	0.00	0.01	55.62
L1-3-2	0.06	0.00	0.00	0.00	0.05	53.84	0.01	0.01	53.97
L1-4-1	0.01	0.01	0.05	0.11	0.09	54.81	0.06	0.00	55.13
L1-4-2	0.02	0.00	0.03	0.00	0.09	54.07	0.13	0.03	54.38
L2-1-1	0.62	0.55	0.05	0.00	0.49	54.50	0.07	0.01	56.39
L2-1-2	0.08	0.04	0.00	0.00	0.06	53.95	0.06	0.01	54.23
L2-1-3	0.02	0.00	0.00	0.01	0.35	53.94	0.00	0.00	54.46
L2-2-1	0.04	0.01	0.03	0.02	0.15	57.13	0.03	0.02	57.43
L2-2-2	0.01	0.00	0.03	0.00	0.07	54.76	0.00	0.00	54.87
L2-2-3	0.05	0.00	0.23	0.00	0.12	56.35	0.04	0.03	56.83
L2-4-1	0.02	0.00	0.00	0.06	0.04	54.78	0.00	0.00	54.91
L2-4-2	0.05	0.00	0.06	0.01	0.23	57.58	0.00	0.00	57.93
L2-4-3	0.10	0.04	1.16	0.04	0.12	54.20	0.23	0.04	55.94
L3-5-1	0.08	0.04	0.02	0.00	0.10	54.83	0.07	0.01	55.18
L3-5-2	0.23	0.17	0.02	0.03	0.35	55.22	0.20	0.04	56.29
L3-5-3	0.26	0.10	0.57	0.13	0.66	57.20	0.24	0.08	59.46
L3-4-1	0.08	0.04	0.32	0.04	0.17	54.96	0.00	0.02	55.65
L3-4-2	0.01	0.01	0.01	0.01	0.35	55.55	0.04	0.00	56.12
L3-4-3	0.36	0.19	0.22	0.01	0.08	57.68	0.06	0.04	58.66
L2-9-3	0.12	0.09	0.00	0.01	0.10	56.57	0.07	0.01	57.03
L2-9-4	0.17	0.08	0.02	0.03	0.06	55.87	0.04	0.01	56.30

样品号	w_B/%
样品号	SiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	Total
L3-6-1	4.78	0.36	71.55	0.11	0.71	0.40	0.03	0.01	0.15	78.12
L3-6-2	3.43	0.30	80.43	0.06	0.36	0.47	0.03	0.00	0.21	85.34
L3-6-3	3.74	0.65	81.07	0.09	0.27	0.86	0.03	0.00	0.21	86.92
L3-6-4	3.04	0.49	76.18	0.02	0.79	0.33	0.01	0.00	0.16	81.03
L3-6-5	3.84	0.70	78.61	0.06	0.41	0.48	0.00	0.00	0.18	84.29
L3-6-6	3.63	0.66	78.57	0.03	0.47	0.48	0.02	0.00	0.16	84.06
L3-6-7	3.65	0.64	78.06	0.04	0.47	0.51	0.03	0.00	0.29	83.69
L3-6-8	3.89	0.68	80.88	0.03	0.26	0.80	0.00	0.01	0.14	86.71
L3-6-9	3.64	0.32	81.93	0.10	0.19	0.51	0.05	0.01	0.10	86.92
L3-6-10	4.06	0.30	72.56	0.11	0.89	0.67	0.04	0.01	0.13	78.79
L1-8-1	3.58	0.45	78.08	0.17	0.54	0.54	0.05	0.01	0.05	83.48
L1-8-2	4.50	0.80	79.06	0.10	0.33	0.38	0.03	0.00	0.15	85.35
L1-8-3	4.47	1.04	79.58	0.28	0.40	0.56	0.09	0.01	0.18	86.63
L1-8-4	3.53	0.27	82.36	0.17	0.20	0.56	0.07	0.03	0.13	87.32
L1-8-5	3.29	0.20	80.73	0.15	0.38	0.47	0.03	0.00	0.10	85.35
L1-8-6	3.92	0.46	80.44	0.17	0.37	0.89	0.09	0.02	0.06	86.45
L2-6-1	5.56	0.26	76.81	0.10	0.78	0.38	0.15	0.09	0.02	84.17
L2-6-2	4.25	0.29	82.39	0.15	0.30	0.56	0.09	0.02	0.07	88.15
L2-6-3	3.88	0.39	85.55	0.18	0.39	0.67	0.08	0.01	0.17	91.34
L2-6-4	3.47	0.30	82.86	0.51	0.40	0.68	0.18	0.05	0.14	88.60
L2-6-5	3.83	0.32	83.45	0.17	0.26	0.70	0.16	0.03	0.12	89.07
L2-6-6	3.80	0.26	82.78	0.12	0.24	0.77	0.09	0.00	0.07	88.18
L2-6-7	5.82	0.34	75.90	0.12	0.89	0.80	0.29	0.07	0.02	84.32
4b4-6-5	4.57	0.95	79.21	0.11	0.95	0.38	0.21	0.02	0.05	86.54
4b4-6-6	2.91	0.10	84.65	0.01	0.30	0.37	0.11	0.00	0.03	88.50
4b4-6-7	4.08	0.11	84.10	0.04	0.42	0.30	0.06	0.02	0.11	89.27
4b4-6-8	2.80	0.07	84.22	0.01	0.26	0.32	0.07	0.00	0.02	87.79
4b4-6-9	3.10	0.05	84.25	0.02	0.30	0.32	0.15	0.02	0.05	88.26
4b4-6-10	5.25	0.68	76.68	0.03	0.80	0.29	0.11	0.00	0.04	83.89
4b4-7-1	4.67	0.26	72.82	0.19	0.76	0.33	0.14	0.00	0.08	79.30
4b4-7-2	3.58	0.08	83.59	0.23	0.36	0.36	0.17	0.02	0.04	88.44

样品号	w_B/%
样品号	SiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	Total
L3-6-1	4.78	0.36	71.55	0.11	0.71	0.40	0.03	0.01	0.15	78.12
L3-6-2	3.43	0.30	80.43	0.06	0.36	0.47	0.03	0.00	0.21	85.34
L3-6-3	3.74	0.65	81.07	0.09	0.27	0.86	0.03	0.00	0.21	86.92
L3-6-4	3.04	0.49	76.18	0.02	0.79	0.33	0.01	0.00	0.16	81.03
L3-6-5	3.84	0.70	78.61	0.06	0.41	0.48	0.00	0.00	0.18	84.29
L3-6-6	3.63	0.66	78.57	0.03	0.47	0.48	0.02	0.00	0.16	84.06
L3-6-7	3.65	0.64	78.06	0.04	0.47	0.51	0.03	0.00	0.29	83.69
L3-6-8	3.89	0.68	80.88	0.03	0.26	0.80	0.00	0.01	0.14	86.71
L3-6-9	3.64	0.32	81.93	0.10	0.19	0.51	0.05	0.01	0.10	86.92
L3-6-10	4.06	0.30	72.56	0.11	0.89	0.67	0.04	0.01	0.13	78.79
L1-8-1	3.58	0.45	78.08	0.17	0.54	0.54	0.05	0.01	0.05	83.48
L1-8-2	4.50	0.80	79.06	0.10	0.33	0.38	0.03	0.00	0.15	85.35
L1-8-3	4.47	1.04	79.58	0.28	0.40	0.56	0.09	0.01	0.18	86.63
L1-8-4	3.53	0.27	82.36	0.17	0.20	0.56	0.07	0.03	0.13	87.32
L1-8-5	3.29	0.20	80.73	0.15	0.38	0.47	0.03	0.00	0.10	85.35
L1-8-6	3.92	0.46	80.44	0.17	0.37	0.89	0.09	0.02	0.06	86.45
L2-6-1	5.56	0.26	76.81	0.10	0.78	0.38	0.15	0.09	0.02	84.17
L2-6-2	4.25	0.29	82.39	0.15	0.30	0.56	0.09	0.02	0.07	88.15
L2-6-3	3.88	0.39	85.55	0.18	0.39	0.67	0.08	0.01	0.17	91.34
L2-6-4	3.47	0.30	82.86	0.51	0.40	0.68	0.18	0.05	0.14	88.60
L2-6-5	3.83	0.32	83.45	0.17	0.26	0.70	0.16	0.03	0.12	89.07
L2-6-6	3.80	0.26	82.78	0.12	0.24	0.77	0.09	0.00	0.07	88.18
L2-6-7	5.82	0.34	75.90	0.12	0.89	0.80	0.29	0.07	0.02	84.32
4b4-6-5	4.57	0.95	79.21	0.11	0.95	0.38	0.21	0.02	0.05	86.54
4b4-6-6	2.91	0.10	84.65	0.01	0.30	0.37	0.11	0.00	0.03	88.50
4b4-6-7	4.08	0.11	84.10	0.04	0.42	0.30	0.06	0.02	0.11	89.27
4b4-6-8	2.80	0.07	84.22	0.01	0.26	0.32	0.07	0.00	0.02	87.79
4b4-6-9	3.10	0.05	84.25	0.02	0.30	0.32	0.15	0.02	0.05	88.26
4b4-6-10	5.25	0.68	76.68	0.03	0.80	0.29	0.11	0.00	0.04	83.89
4b4-7-1	4.67	0.26	72.82	0.19	0.76	0.33	0.14	0.00	0.08	79.30
4b4-7-2	3.58	0.08	83.59	0.23	0.36	0.36	0.17	0.02	0.04	88.44

样品号	w_B/10^-6
样品号	Sc	TiO₂	V	Cr	MnO	Co	Ni	Cu	Ga	Rb	Sr	Y	Zr	Nb	Cs	Ba	La
L1-6	0.20	5.45	754.70	21.98	1 951	47.21	120.40	2 462.00	10.62	0.31	61.17	5.14	0.27	0.01	-	220.10	1.33
L1-8	0.26	103.30	904.00	19.37	2 239	739.10	324.90	3 113.00	7.90	-	49.23	8.59	0.60	0.14	0.06	122.70	2.47
L2-6	0.19	127.70	424.60	136.70	3 516	26.54	26.82	458.00	8.42	0.26	59.82	4.87	4.51	0.14	0.07	188.60	0.86
L2-8	1.44	-	1 000.00	20.40	2 603	48.16	42.77	3 742.00	12.34	-	41.27	23.84	11.10	0.00	0.04	83.72	7.21
样品号	w_B/10^-6
样品号	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Hf	Ta	Pb	Th
L1-6	0.16	0.39	1.87	0.61	0.25	0.73	0.14	0.90	0.15	0.50	0.06	0.50	0.03	0.01	0.01	7.25	0.00
L1-8	1.54	0.74	3.38	1.11	0.24	1.26	0.23	1.23	0.24	0.71	0.11	0.62	0.12	0.01	0.00	12.14	0.58
L2-6	2.54	0.24	0.99	0.44	0.08	0.58	0.11	0.64	0.14	0.47	0.07	0.41	0.04	0.03	0.01	54.45	0.04
L2-8	4.98	1.62	7.82	2.12	0.73	3.58	0.67	4.54	1.00	3.69	0.47	3.78	0.60	0.12	0.00	14.26	0.01