2. geothermal anomalous belts(high heat flow, high geothermal gradient and/or (mid-weak ho-springs ); 3. positive anomalous magnetic belts or local magnetic highs; 4. seismic zones and shallow focus earthquakes);
It shows that there is a forerunner of torrential rain on the underlying heat field, that is the upward geothermal heat flux from deep layer to earth surface.
The geothermal fields in East China are of the areal and zonal properties,in which the Tanlu fault zone is an active zone of high geotherm,being closely related to its tectonic portion and to the tectonic events since Indosinian movement.
The high geothermal field during fault-subsidence and further deeply buried in depression stage would cause the source rocks to be in their hydrocarbon-generating stage.
A improved TL dating method has been applied to sureface alteration rocks from some geothermal fields in the Hohi area, Kyushu, Japan. In the result, natural TL intensity of most samples is smaller than 100 mGy/g in very active geothermal field, n×10 to n×100 mGy/g in less active fields, and it ranges widely that altered rocks containing quartz have TL larger than 1 000 mGy/g while those containing cristoblite have small in non active fields.
The formation and exposure of Jiaodong warm springs arc closely related to the geo-rectornic unit,geological and geomorphlogical features, activity of meotectonic movement, and the relatively high geothermal background in the area The exposure of the warm springs and the distribution of the geothermal anomalies arc mainly controlled by the fracture structures.
Gaolong gold deposit occurs in Youjiang rift zone of Dian(Yunnan)-Qian(Guizhou)-Gui(guangxi) rift. It is a high temperature geothermal field. The deposit formed in a relatively closed local depression with a reductive geochemical barrier. There are carboniferous simultaneous breccia, silicified structure breccia and syndepositional fracture system of growing fracture. The orebodies are stratiform-like or stratiform with several layers and coexisted with vein type orebodies. There are breccia and bedded stru...
The northwest Guangxi belongs to the rift zone of Dian(Yunnan)-Qian(Guizhou)-Gui(Guangxi) with a high temperature geothermal field. The strata are mainly late Paleozoic-Mesozoic with widely distribution of Triassic strata.There are a lot of lifts in late Paleozoic sag,and growth faults are developed in the margin of the lifts.The environment and geological conditions are favorable for mineralization.The micro-disseminated gold deposits such as Ganlong,Longhuo,Badu and Longchuan constitute an ore-forming ser...