吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (3): 662-672.doi: 10.13278/j.cnki.jjuese.20180067
单玄龙1, 蔡壮1, 郝国丽1, 邹欣彤2, 赵容生1
Shan Xuanlong1, Cai Zhuang1, Hao Guoli1, Zou Xintong2, Zhao Rongsheng1
摘要: 长白山地区地热系统的研究目前还处于初级阶段,热储温度仍然是具有争议的问题。为进一步明确其高温地热成因机理,本文对该区域的4个温泉点与2口地热井进行了离子及气体组分测定与分析,并应用地球化学温标估算了热储温度。Na-K-Mg三角图和部分矿物IS值指示长白山地区地热水与围岩未达到水岩平衡状态,稀释作用明显,仅石英、玉髓和部分含Ca2+矿物达到饱和并发生沉淀。根据本文及前人的研究,研究区同时存在高温喷气孔、高ρ(Cl-)水和高ρ(SO42-)水,这符合White汽-液分离模式提出的地热地表显示组合,因此推断长白山地区下部流体发生汽-液分离作用(沸腾)且地热系统为双相地热系统。由于双相地热系统的存在制约了水化学温标与部分气化学温标在研究区热储温度估算中的应用,因此本文结合研究区气组分特征,选取CO2/H2温标作为可靠温标,估算出热储温度在234.5~284.7℃之间。将长白山天池地区地质特征与地热流体特征结合,建立了长白山地区地热成因模式。
中图分类号:
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