Proterozoic Sediment Hosted Base Metal Deposits of Western Gondwana (IGCP Project 450)

Iyer, Brijesh; Kamona, A.F.; Misi, Aroldo; Cailteux, Jacques

doi:10.1016/s1342-937x(05)70763-2

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, problems in acquiring reliable paleothermal data and difficulties in developing suitable methods of data analysis and interpretation techniques have impeded better understanding of paleo heat flow variations of the geologic past. Nevertheless, recent progress obtained in mineral thermometry and temperatures of fluid inclusions have opened up new perspectives (Iyer, 2001). In the present work we consider use of temperatures of fluid inclusions in determining paleothermal conditions in areas of sedimentary exhalative (SEDEX) deposits.…”

Section: Introductionmentioning

confidence: 99%

Paleo heat flow in areas of Sedimentary Exhalative (SEDEX) deposits of Eastern Brazil

Iyer

Hamza

2019

ijthfa

View full text Add to dashboard Cite

Representative values of fluid inclusion temperatures and radiogenic heat production values have been compiled as part of an attempt to determine paleo heat flow in areas sedimentary exhalative (SEDEX) deposits in thirteen localities of eastern Brazil. The results obtained indicate heat flow in excess of 80 mW/m2in areas of mineral bearing sulphide ore deposits, during periods of ore forming processes. Such anomalously high heat flow are more than twice the present-day values for stable tectonic units of Precambrian age. There are indications that high heat flow values were sustained by circulation of hydrothermal fluids in the upper crust, during periods not exceeding a few hundred million years. The resulting geothermal episodes may be considered as constituting short-period “heat pulses” occurring in stable tectonic environments, generated by magma emplacements in the upper crust, leading to formation of areas of sulfide ore deposits. Model simulations indicate that subsidence episodes induced by stretching and magma under-plating constitute the mechanisms for high heat flow during the ore-forming processes.

show abstract

Section: Introductionmentioning

confidence: 99%