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Topic: Mesothermal

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	Mesothermal - Wikipedia, the free encyclopedia
		In climatology, the term mesothermal is used to refer to certain forms of climate found typically in the Earth 's Temperate Zones.
		The term is derived from two Greek words meaning "having a moderate amount of heat." This can be misleading, however, since the term is actually intended to describe only the temperature conditions that prevail during the winter months, rather than those for the year as a whole.
		In addition to being subdivisible by summer temperature, mesothermal climates can also be subclassified on the basis of precipitation — into humid, semiarid and arid subtypes.
	en.wikipedia.org /wiki/Mesothermal (186 words)

	Oceanic climate - Wikipedia, the free encyclopedia
		This means that precipitation is both adequate and reliable at all times of the year in oceanic climates, except in certain tropical highland areas, which would have tropical savanna climates (with a dry season in winter) if not for the high altitude making them cooler.
		Overall temperature characteristics vary among oceanic climates; those at the lowest latitudes are subtropical from a thermal standpoint, but more commonly a mesothermal regime prevails, with cool, but not cold, winters.
		With one significant exception, oceanic climates are classified as humid with respect to precipitation, the only major example of a dry oceanic climate being that of Patagonia.
	en.wikipedia.org /wiki/Oceanic_climate (219 words)

	MESOTHERMAL, OROGENIC GOLD MINERALIZATION IN GUATEMALA (Site not responding. Last check: 2007-11-07)
		Mesothermal, orogenic gold mineralization is represented by gold-arsenic (+/- antimony) quartz (+/- feldspar) veins occurring in the Jurassic-Cretaceous Tambor Formation in central Guatemala.
		Veins are interpreted as mesothermal based on textural evidence, lack of obvious vertical zonation, and fluid inclusion studies.
		The mesothermal veins may be further classified as orogenic gold deposits, comparable in style to Reefton, New Zealand; Victoria Gold Fields, Australia.
	gsa.confex.com /gsa/2003CD/finalprogram/abstract_51687.htm (276 words)

	Researach Activities (Site not responding. Last check: 2007-11-07)
		Mesothermal gold deposits are typically located in low displacement faults and shear zones.
		By analogy with the distribution of slip in modern seismogenic systems, the low displacement faults which host mesothermal gold deposits are interpreted as aftershock structures whose development is related to stress changes driven by repeated large slip events on the nearby, crustal-scale shear systems.
		ST modelling is being tested in the WA goldfields for its potential as a tool to predict the distribution of low displacement faults and shear zones, and associated domains of high fluid flux in ancient, gold-hosting shear systems.
	wwwrses.anu.edu.au /oregen/2001AR/Earthquakes.html (848 words)

	Deposit Models - Mesothermal Gold Veins, B.C. Geological Survey (Site not responding. Last check: 2007-11-07)
		In contrast, published K/Ar data for deposits associated with the Slide Mountain Terrane suggest that mineralization was temporally much less restrictive and formed during a period of uplift and extension in Early Cretaceous.
		Mesothermal gold quartz vein deposits are found along suture zones where affected by intense and pervasive carbonate alteration that is closely associated with late syn-collisional, structurally controlled intermediate to felsic magmatism They are potentially economic where hosted by relatively large, competent tectonic blocks of obducted oceanic crust.
		Conversely, discovery of these high-grade gold veins in frontier areas should spur exploration for additional deposits of this type, and for all the associated mineral deposit types of the volcanic arc environment.
	www.em.gov.bc.ca /mining/Geolsurv/MetallicMinerals/depmodel/3-auvein.HTM (1161 words)

	Virtual Andean Tourist Routes - Ecuador - Climate /Andean Community - 2002
		In the interior of the province, there is a humid and semi-humid mesothermal climate, while in the western part, the climate is temperate and sub-Andean tropical with permanent humidity.
		The climate is a humid and semi-humid mesothermal bleak moor type with temperatures ranging from 10° to 15ºC. Towards the Chota Valley, the climate is a dry mesothermal one.
		the climate varies from the freezing cold of the high peaks to the humid and semi-humid mesothermal climate of the high plateaus and on to the tropical monsoon climate of the lowest plateaus and the coast.
	www.comunidadandina.org /ingles/tourism/ecuador/climate.htm (501 words)

	MESOTHERMAL
		"MESOTHERMAL" is a common misspelling or typo for: exothermal, geothermal.
		Said of a hydrothermal mineral deposit formed at considerable depth and in the temperature range of 200 to 300 degrees C. Also, said of that environment.
		" MESOTHERMAL " is generally used as an adjective (general or positive) -- approximately 100.00% of the time.
	www.websters-online-dictionary.org /definition/english/ME/MESOTHERMAL.html (347 words)

	News Release (Site not responding. Last check: 2007-11-07)
		This was in spite of the facts that the vein system was atypical of other Dunnage Zone "mesothermal" types in that it contained tungsten (W), was hosted by a granitoid, and was of such a large singular size.
		which are low for mesothermal systems); and the vein itself has local zones wherein the quartz is completely recrystallized (subgrains developed), and elsewhere has excellent crack-seal features indicating a complex hydrothermal origin with multiple pulses of fluid.
		W, As and anomalous Sb contents are also atypical for NF mesothermal systems, but could be viewed as being consistent with a SHDG model.
	vikinggold.ca /20020516p.html (665 words)

	Geographic Information System: the PEIN (Plan for Areas of Natural Interest) (Site not responding. Last check: 2007-11-07)
		Mesothermal III (B’3) from 855 to 977 mm
		Mesothermal II (B’2) from 712 to 855 mm
		Mesothermal I (B’1) from 572 to 712 mm
	www.gencat.net:8000 /mediamb/sig/fevapot-a.htm (142 words)

	ICMJ's PROSPECTING and MINING JOURNAL -- Epithermal Ore Deposits Associated with Tertiary Volcanism (Site not responding. Last check: 2007-11-07)
		Hypothermal ore deposits are associated with ancient plutonic intrusive rocks, the ores having formed at temperatures from 300 to 600 degrees Centigrade, and at the time of their deposition, at great vertical depths of several miles or more—the actual vertical range exceeding the minable depths that man can mine.
		Mesothermal ore deposits are commonly associated with intrusive granites with temperatures ranging from about 175 to 300 degrees Centigrade and forming at depths of two or more miles.
		Epithermal ore deposits are common in regions of late volcanic activity, especially areas associated with Miocene and later Pliocene extrusive volcanics that have not been deeply eroded since the ore was deposited.
	www.icmj2.com /OtherRecentArticles/Epithermal.htm (1624 words)

	Mining Interactive: Focus on Mawson Resources.
		Orogenic mesothermal gold deposits of the Skellefte District show close similarity to those in other Proterozoic greenstone-terrane gold camps such as the Tanami (Northern Territory, Australia) and the Southern Cross district (WA, Australia).
		The orogenic mesothermal gold systems are found within a district of mixed metasediments and batholithic intrusions.
		Multi-million ounce orogenic mesothermal deposits are yet to be identified in the Skellefte District, providing the key opportunity to discover a world class analogue or camp.
	www.mininginteractive.com /company-focus/mawson/skellefte-district.htm (1124 words)

	Golden Phoenix Minerals: Projects - Mineral Ridge Gold Mine, NV
		The most important is the mesothermal gold quartz veins and adjacent silicified zones that historically have been recognized at the only gold producing system on the property.
		The epithermal quartz-sulfide veins and breccias occupy late cross structures formed while the Mineral Ridge core complex was being uplifted from the ductile to the brittle environment.
		The exploration potential was analyzed by identifying both mesothermal and epithermal targets.
	www.golden-phoenix.com /Projects/Mineral-ridge/mr_potential.htm (344 words)

	N.S. Bortnikov (Site not responding. Last check: 2007-11-07)
		The results of study of mineralogy and geochemistry two giant mesothermal gold deposits from the former USSR may change our knowledge on the gold behaviour in the hydrothermal processess.
		This study demonstrates that in the mesothermal environment gold precipitated at the earliest stage in the form native metal or of solid solution in arsenopyrite and pyrite and may remain in a fluid for a long time.
		As a co-precipitation of native gold and gold-bearing sulfide do not proceed the main conclusions that could be made that gold-bearing sulfides precipitate as a rule from a fluid which was undersaturated in relation to gold.
	www.huxley.ic.ac.uk /research/basins/wilkinson/mdsg/webpages/IGCPAbstracts/bortniko.htm (954 words)

	Rimfire Minerals Corporation - Williams Gold, BC - Property Status - Wed Aug 3, 2005 (Site not responding. Last check: 2007-11-07)
		The William's Gold Property hosts two distinct but possibly related, styles of gold mineralization; mesothermal and intrusion-related.
		Previous exploration has concentrated on the mesothermal mineralization of the Dome prospect, attempting to identify high-grade veins or vein swarms amenable to underground mining.
		Intrusion-related gold mineralization at the Northern (formerly the Park) prospect has received less exploration and is not as well understood as mesothermal mineralization at the Dome.
	rimfireminerals.com /s/WilliamsGold.asp?ReportID=64772&... (680 words)

	Abstract: GJ, Vol. 36 (No. 2), pp. 155-171 (Site not responding. Last check: 2007-11-07)
		Abstract: Mesothermal gold-quartz veins of the Youngbogari deposit in the Youngdong area, South Korea, are hosted in faulted shear zones in Precambrian gneiss of the Sobaegsan massif.
		A variety of geochemical data indicate that deposition of the mesothermal gold-silver ores of the Youngbogari deposit resulted mainly from cooling of ore fluids accompanying decreasing sulfur fugacity.
		S values (-2.9 to -5.1‰), compared to other mesothermal gold deposits of the Youngdong area, are interpreted to reflect a more oxidizing nature of the Youngbogari ore fluids, likely due to less reaction with graphite in wallrock gneiss.
	www.terrapub.co.jp /journals/GJ/abstract/3602/36020155.html (276 words)

	UNIVERSITY OF GENEVA - DEPARTMENT OF MINERALOGY - ORE DEPOSITS
		The Pataz gold province is situated 500 km north of Lima on the Eastern Cordillera of the North Peruvian Andes, and constitutes the northernmost part of a Carboniferous mesothermal Au and Sb belt, which extends along the entire cordillera down to northern Argentina.
		Fluid inclusion data, accompanied by stable and radiogenic isotope determinations, set constraints on the composition and origin of the hydrothermal fluid(s) involved in the genesis of the gold lodes.
		The lodes, hosted by second and third-order structures, appear predominantly as kilometer-long continuous quartz veins enclosed at the margin of the batholith, and less abundantly as split and sheared bedding-concordant ore shoots in the adjacent phyllites and slates.
	www.unige.ch /sciences/terre/mineral/people/haeberlin/pataz/pataz.html (3371 words)

	New Zealand Minerals \| Gold deposits (Site not responding. Last check: 2007-11-07)
		More detailed information can be found in Williams (1974), Brathwaite and Pirajno (1993) and the various reports of the Geological Resource Map of New Zealand 1:250,000 map series produced by the Institute of Geological and Nuclear Sciences.
		Turbidite-hosted mesothermal gold deposits are found in Ordovician rocks at Golden Blocks in Northwest Nelson, at Mokihinui, Lyell, Reefton, Langdons and Mt. Greenland on the West Coast, and at Preservation Inlet in Fiordland, and have accounted for about 8% of New Zealand's total gold production.
		Turbidite-hosted mesothermal quartz lode gold deposits are found in the Haast Schist of Otago, Marlborough and Southern Alps.
	crownminerals.med.govt.nz /minerals/resources/gold/deposits.html (1077 words)

	[No title]
		Unlike the PCD's, in which the ore occurs either disseminated or in veins in the igneous intrusion and the country rocks, base metal lodes (BML) are concentrated in the country rock, and are not as disseminated.
		Accordingly, it is perhaps appropriate to list some of the general characteristics of mesothermal deposits before we describe the base metal lode deposits.
		General characteristics of Mesothermal deposits: 1- Unlike hypothermal deposits which are characterized by replacement type textures, mesothermal deposits tend to have both replacement and open space filling textures, with the latter more common in shallower deposits.
	www.science.marshall.edu /elshazly/Econ/Base.doc (819 words)

	Groundwater flow in playa lake environments: Impact on Gold and pathfinder element distributions in groundwaters ...
		The St Ives area, Eastern Goldfields, Western Australia, is located on the edge of a playa lake and is the site of numerous Archaean mesothermal gold deposits.
		None of the other elements commonly thought to be pathfinders for mesothermal Au mineralisation (As, Sb, Se, Bi, Mo, W, Ag, Cs, Te, Pb) gave a response.
		Mo, Bi, Te and W concentrations are too close to the detection limits of the technique used for the data to be reliable, however meaningful data was obtained for the remaining elements.
	www.aeg.org /abstracts/australia9.htm (570 words)

	Exploration History and Geology of the Dominion Creek Mesothermal Vein Prospect, East-Central B.C. (Site not responding. Last check: 2007-11-07)
		Most of the area is forested with mature stands of spruce and balsam fir, along with a dense underbrush of dwarf willow, huckleberry and devils club.
		Several high grade precious and base-metal mesothermal veins were discovered by prospecting in 1986.
		Auriferous mesothermal quartz-sulphide veins are developed in limestone and argillite of the upper Isaac Formation west of the Isaac Lake Fault.
	www.em.gov.bc.ca /mining/geolsurv/Publications/expl_bc/1998/Part_B/dominion.htm (2972 words)

	IUGG 2003 Scientific Program (Site not responding. Last check: 2007-11-07)
		The model successfully reproduces the mesothermal structure consisting of the shallow temperature minimum and the underlying temperature maximum that are so called the dichothermal and mesothermal waters, respectively.
		The mesothermal water is formed through cross-gyre exchange between the subtropical and subarctic gyres, whereas the dichothermal water originates from cold and low-salinity waters formed in the wintertime mixed layer.
		The mesothermal water thus formed in the subarctic region is entrained into the mixed layer in winter, and flows out to the subtropics by southward Ekman drift, forming the subpolar cell (SPC).
	www.olympus.net /IAPSO/abstracts03/P01/05/019531-1.html (355 words)

	Cordilleran Mineral Deposits Video Library
		Mesothermal gold mineralisation in zoned skarn alteration and brecciated zones within the Lower Jurassic volcano-sedimentary rocks of the Rossland Group.
		Virtually every known type of mineralisation is represented, from relatively deep mesothermal veins and porphyry systems to paleosurface-related hot spring systems.
		Porphyry Cu-Au, mesothermal shear vein, breccia systems and a variety of epithermal systems are presented by eight major mineral deposits in the Iskut-Stikine.
	www.amproductions.com /videos/mining/cseries.html (2600 words)

	Aldridge Formation Lithogeochemistry
		The Mt. Charlotte mesothermal gold deposit, Kalgoorlie, Western Australia, is a two-dimensional stockwork vein system bounded by several steeply dipping faults within the Archean Norseman-Wiluna greenstone belt.
		Host rocks include three upper units of the Golden Mile dolerite, a differentiated mafic sill with zoned cumulate, ophitic and granophyric textures that intrudes fl shales folded by the Kalgoorlie syncline and was metamorphosed to greenschist grade.
		Fluid composition, temperature and pressure are constrained by the deduced chemical reactions, and appear to be similar to other mesothermal Au vein fluids.
	www.aeg.org /abstracts/australia3.htm (898 words)

	Ore Genesis (Site not responding. Last check: 2007-11-07)
		Sulfur isotope data and calculated fluid-rock reaction paths constrain the origin of pyritic gold ores in the Victory mesothermal gold deposit of Western Australia.
		O range from -4.4 to +5.1 and are negatively correlated with gold tenor in mafic host rocks, indicating a significant increase in fluid oxidation state accompanied mineralization.
		Because both wall rock carbonation and fluid phase separation involve loss of aqueous sulfide, but do not require precipitation of iron sulfides, they may explain the poor correlation between gold tenor and pyrite abundance in many mesothermal deposits and the occurrence of some gold ores in iron-poor roc ks.
	www.rses.anu.edu.au /oregen/Abstracts/Gilt.html (214 words)

	WildWNC.org : Trees : Sweet Pignut Hickory (Site not responding. Last check: 2007-11-07)
		According to one classification of climate (20), the range of pignut hickory south of the Ohio River, except for a small area in Florida, is designated as humid, mesothermal.
		That part of the range lying north of the Ohio River is designated humid, mesothermal.
		Mountains in Pennsylvania, West Virginia, North Carolina, and Tennessee are classed as wet, microthermal, and mountains in South Carolina and Georgia are classed as wet, mesothermal.
	wildwnc.org /trees/Carya_glabra.html (3171 words)

	Alba Knapdale Mesothermal Gold Project
		AMR plans to explore 237.6 square kilometres of ground at Knapdale, Argyllshire in Scotland targeting mesothermal lode gold mineralization, similar to that being targeted at Calliacher.
		The Knapdale area lies at the head of the Kintyre peninsula on the shores of Loch Fyne, where auriferous, base-metal rich (pyrite, chalcopyrite and galena) quartz veins are associated with arsenic and antimony stream sediment and soil anomalies at Stronchullin.
		AMR have begun a process of electronically recording all available data for the Knapdale Gold Project as a prelude to detailed prospecting mapping and stream sediment sampling programmes.
	www.albamineralresources.com /text/projects/knapdale.html (181 words)

	Hydrothermal (Site not responding. Last check: 2007-11-07)
		Mesothermal deposits have less pronounced (more subtle) alteration because they are deeper, tapping deeper fluids.
		The fineness of gold in epithermal deposits is between 500 and 700; in mesothermal deposits it is 700 to 900 (higher number = closer to pure gold).
		Mesothermal gold deposits form along shear zones in greenstone belts.
	gemoc.anu.edu.au /course/geol3007/Hydrothermal.html (4135 words)

	ECOBIO BIOTECH CO.,LTD - , manufacturer and exporter, manufaturer and exporter (Site not responding. Last check: 2007-11-07)
		Detail: CELLULASE is a kind of special enzyme preparation for foodstuff, which is made by Penicllium decumbens through biological ferm...
		Detail: MESOTHERMAL ¦Á-AMYLASE is a kind of special enzyme preparation for foodstuff, which is made by Bacillus stbtillisin (E.C.3.2.1...
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	product.globalimporter.net /china-sample/26244/ECOBIO+BIOTECH+CO%2E,LTD/1.htm (155 words)

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