摘要
本文报道了湖滨温泉强气体释放带地球化学特征。湖滨温泉强气体释放带位于天文峰下长白山天池火山口北岸,是一处大规模热水强烈释放区域。天文峰顶部的极新的喷发物年代尚有争议,它们应当是近代某次中小规模喷发或千年大喷发的残留物。湖滨温泉区域逸出气体的地球化学研究对揭示区域火山活动有现实意义。本文通过对长白山天池火山口湖内湖滨气体强释放带的考察采样,全面分析了湖滨温泉区域逸出气体的地球化学特征。结果显示,这些气体中富含CO2、He、CH4、Ar等深源气体。He同位素比值为4.81~5.95,依据4He/20Ne同位素值和He含量计算的幔源气体含量平均为67.1%,显示湖滨区域是一处大规模、高强度深源气体释放的特殊区域。He同位素空间分布呈凹形特征可能与区域火山机构有关,深部幔源气体的大规模释放很可能是最新火山喷发的残留气体。本文提供了天池湖滨温泉地球化学初步的直接证据。
This paper reported the geochemical features of gas emitted from the Hubin Springs.The Hubin Springs zone,a strong thermal emission zone,locates at the north edge of the Tianchi caldera lake.Very young deposits with uncertain eruption dating data are found on the top area of the Tianwenfeng,they might be formed in one of the recent eruptions or the millennium eruption.It is significant to study geochemistry features of the emitting gas from the Hubin Springs to understand the activities of the Tianchi Volcano.This paper systematically sampled and analyzed the emitting gases from the Hubin Springs,and discussed their geochemistry features.The results showed that there are high contents of the deep derived gases,such as CO2,He,CH4 and Ar in Hubin Springs zone.The isotopic ratio of He lies between 4.18 and 5.95 Ra.An averaged mantle-derived gas content calculated from 4He/20Ne ratio and He content reached to 67.1%.All of these showed that the Hubin Springs located on a special belt of deep gases releasing in high intensity and big scale.The spatial distribution of Helium isotope is characterized by concave,showing that this special area may be related to the volcanic edifice.It is highly possible that the released gases represent the resident gas samples of the latest eruption from the Tianchi Volcano.However,more detailed studies are demanded.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2010年第3期244-249,共6页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金资助项目(40172033)
