mesothermal


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mesothermal

[¦mez·ə¦thər·məl]
(mineralogy)
Of a hydrothermal mineral deposit, formed at great depth at temperatures of 200-300°C.
References in periodicals archive ?
On the basis of a verified pressure of 15.2-27.4 MPa, the depth of mineralization can be determined to have been 160-280 meters--thus the process can be described as near-surface and mesothermal. On the basis of a study of the [.sup.40]Ar/[.sup.39]Ar isotopes, ore formation can be dated to 187 million years ago, during the Yanshanian Epoch.
The Ordovician basin can be traced in Bolivia, Peru, Ecuador, Australia and New Zealand, with similar mesothermal gold mineralisation.
Climatographically, the area is dry, subhumid to semiarid, and mesothermal (Thornthwaite, 1948).
The main gold vein prospect on the property occurs as low-sulfide, mesothermal quartz veins within Nicola Group siltstone and graywacke.
(2016) studying the same cultivars in subtropical mesothermal climate, observed that 'Cherokee' cultivar presented the shortest flowering period when compared to the other cultivars.
The experimental area presents a dystrophic red latosol; it has a tropical climate with mild summers, which is defined as humid mesothermal type Cwb weather according to Koppen classification.
The local climate, according to Koppen's classification, is Cfa, subtropical mesothermal. The protected environment had an arched roof, covered with polyethylene film (150 [micro]m) and white shade screen on the sides.
It is suggested that the Shihu gold deposit was formed at ca.141 Ma (Quartz [sup.40]Ar-[sup.39]Ar age), and the ore-forming fluids in this deposit were characterized by low salinity, mesothermal, and C[O.sub.2]-[H.sub.2]O-NaCl system and were mainly derived from the lower crust with minor mantle component [20-22].
By Koppen's classification, the region's predominant climate is Cfa, or rather, subtropical hot, mesothermal climate, with a yearly average temperature of 22oC.
Around 500 grams of fruits of the cultivars above reported were collected at the physiological maturity point in two different places, one being a commercial orchard situated on the Mantiqueira Mountains (Campos do Jordao town, Sao Paulo State, 1,628 meters of elevation, Cwa climate, mesothermal with dry winter, commonly named tropical de altitude (Cwb), according to Koppen classification) and another in Alto do Rio Grande (Lavras town, Minas Gerais State, 918 meters elevation, Cwb climate, with dry winter and summer temperate).
Graduating with a degree in geology from the University of Otago in 1994, he has since held exploration and development roles in a variety of terrains including the Archaean Greenstone belts of Western Australia, Proterozoic gold and base metal systems in Zambia, porphyry gold-copper deposits in the Romanian Carpathians and Ordovician orogenic mesothermal gold mineralisation in New Zealand's South Island.