Effect of Miocene basaltic volcanism in Shanwang (Shandong Province, China) on environmental changes

doi:10.1007/s11430-007-0119-4

	Effect of Miocene basaltic volcanism in Shanwang (Shandong Province, China) on environmental changes
	Guo ZhengFu; Liu JiaQi; Chen XiaoYu
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2007-12-01
卷号	50 期号:12 页码:1823-1827
关键词	volcanic volatiles paleo-environment acid rain basalt Shanwang
ISSN号	1006-9313
DOI	10.1007/s11430-007-0119-4
文献子类	Article
英文摘要	Miocene (16-10 Ma) basalts, together with significantly well-preserved fossils (including animal and plant fossils) in the contemporaneously tephra-rich Maar sediments, are located in Shanwang volcanic region, Shandong Province, China. Distribution area of the basaltic eruption products is about 240 km(2). Detailed field observations indicate that most of basaltic rocks are fissure eruptive products and some are central eruptives constrained by linear faults. The well-preserved fossils in the lacustrine deposits have been considered to be a result of mass mortalities. Based on physically volcanologic modeling results, eruption column of the basaltic fissure activities in the Shanwang volcanic region is estimated to have entered the stratosphere. Petrographic observations indicate that the basalts have porphyritic textures with phenocrysts of olivine, pyroxene, plagioclase feldspar and alkali feldspar setting in groundmass of plagioclase feldspar, alkali feldspar, quartz, apatite and glass. Based on observations of tephra, tuff and tuffites collected in the Maar sediments of the Shanwang area, we determined major element oxide concentrations and volatile composition of melt inclusions in phenocrysts and matrix glasses by electron microprobe analysis. Volatile (including S, Cl, F and H(2)O) concentrations erupted into the stratosphere were estimated by comparing pre-and post-eruptive volatile concentrations. Our determination results show that contents of S, Cl, F and H(2)O emitted into the stratosphere were 0.18%-0.24%, 0.03%-0-05%, 0.03%-0.05% and 0.4%-0.6%, respectively, which was characterized by high-S contents erupted. Amounts of volatiles emitted in the Shanwang volcanic region are much higher than those in eruptions which had a substantial effect on climate and environment. According to the compositions and amounts of the volatiles erupted from the Miocene basaltic volcanism in Shanwang, we propose a hypothesis that volatile-rich basaltic volcanism could result in the mass mortalities by injecting volatiles (e.g., SO(2), H(2)S, HCl, HF and H(2)O) into the stratosphere that would have triggered abrupt environmental changes (including formation of acid rain, temperature decline, ozone depletion, etc.) and altered lake chemistry, and subsequently volcanic ash fall buried and covered the dead animals and plants, forming well-preserved fossils in Shanwang Maar sediments.
WOS关键词	BAITOUSHAN VOLCANO ; VOLATILE EMISSION ; ERUPTION ; AD ; SULFUR
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000251020300007
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67272]
专题	中国科学院地质与地球物理研究所
通讯作者	Guo ZhengFu
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Guo ZhengFu,Liu JiaQi,Chen XiaoYu. Effect of Miocene basaltic volcanism in Shanwang (Shandong Province, China) on environmental changes[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2007,50(12):1823-1827.
APA	Guo ZhengFu,Liu JiaQi,&Chen XiaoYu.(2007).Effect of Miocene basaltic volcanism in Shanwang (Shandong Province, China) on environmental changes.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,50(12),1823-1827.
MLA	Guo ZhengFu,et al."Effect of Miocene basaltic volcanism in Shanwang (Shandong Province, China) on environmental changes".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 50.12(2007):1823-1827.