作者机构：
[Wen, Xia] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.;[Wen, Xia; Zhao, Junming; Mason, Roger; Sang, Longkang; Ma, Changqian] China Univ Geosci, State Key Lab Geol Proc & Min Resources, Wuhan 430074, Peoples R China.;[Wen, Xia; Zhao, Junming; Mason, Roger; Sang, Longkang; Ma, Changqian] China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China.
通讯机构：
[Ma, Changqian] C;China Univ Geosci, State Key Lab Geol Proc & Min Resources, Wuhan 430074, Peoples R China.
关键词：
accreted lapilli;cone-sheets;alkaline ring complex;K-feldspar fractionation;ignimbrite;Houshihushan alkaline ring complex
摘要：
In addition to syenite ring dykes and multiple alkaline granite stocks, the sub-volcanic Houshihushan alkaline ring complex near Shanhaiguan, Qinhuangdao City, contains cone-sheets of two types: a majority filled with granite porphyry and a minority filled with quartz syenite porphyry. Many cone sheets show evidence of multiple magma intrusion events. Some granite porphyry sheets’ multiple chilled margins display magmatic roll structures indicating that turbulent magma flowed up the fractures. In one upward-closing cone-sheet K-feldspar phenocrysts floated up through fluid granite porphyry magma and became concentrated at the top providing direct evidence of shallow-level crystal fractionation, confirmed by published rock analyses. Accreted lapilli with K-feldspar crystal cores occur only in the inner parts of a minority of cone-sheets and field relationships indicate that they must have formed beneath the ground surface. Similar lapilli occur in erupted ignimbrites preserved in the collapsed caldera. Voids between lapilli in cone-sheets indicate the presence of volumes of gas below the surface that could have flowed upwards as fast-moving hot gas streams. We propose a mechanism of formation that began with subterranean magmatic rolls with K-feldspar crystal cores that formed on dyke walls, and became detached. Then they were caught up in rising gas streams and erupted at the surface. Thus accreted lapilli formed underground, were erupted along with blobs of fluid glass in escaping gases, and transported over the surface in nuées ardentes, to settle and cool as ignimbrite flows.
作者机构：
[戴剑勇; 孟令聪] School of Engineering of Nuclear Resources, University of South China, Hengyang;Hunan;421001, China;[邹树梁] Key Laboratory of Emergency Safety Technology and Equipment of Nuclear Facilities in Hunan Province, Hengyang;[戴剑勇; 孟令聪; 邹树梁] Hunan
作者机构：
[叶勇军; 赵娅利; 谢东; 李向阳; 钟永明; 王立恒] School of Environment Protection and Safety Engineering, University of South China, Hengyang, China;[叶勇军; 丁德馨] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
通讯机构：
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
作者机构：
[叶勇军; 王立恒; 曹雅琴; 赵娅利; 范楠彬] School of Environmental Protection and Safety Engineering, University of South China, Hengyang, China;[丁德馨] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
通讯机构：
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
作者机构：
[杜雪明; Zeng, Sheng; 谭凯旋] School of Nuclear Resources Engineering, University of South China, Hengyang, China;[孙冰] School of Urban Construction, University of South China, Hengyang, China
通讯机构：
School of Urban Construction, University of South China, Hengyang, China
作者机构：
[李广悦; 刁宁宁; 王永东; 杜康; 张振远] Key Discipline Laboratory for National Defense of Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;Hunan;421001, China;School of Nuclear Resources Engineering, University of South China, Hengyang;[李广悦; 刁宁宁; 王永东; 杜康; 张振远] Hunan
期刊：
Journal of Engineering and Technological Sciences,2015年47(6):623-632 ISSN：2337-5779
通讯作者：
Sun, Bing(sunbingzs@126.com)
作者机构：
[Ma, Aiyang; Zeng, Sheng; Zhang, Jing] School of Nuclear Resources Engineering, University of South China, NO28, West Changsheng Road, Hengyang, China;[Sun, Bing] Institute of Urban Construction, University of South China, Hengyang, China
通讯机构：
Institute of Urban Construction, University of South China, Hengyang, China
作者机构：
[马华龙; 吴宇琦; 陈胜; 唐振平; Zeng, Tao-Tao; 谢水波; 凌辉] Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, China;[谢水波] Key Discipline Laboratory of National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
通讯机构：
Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang, China
