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Borovitsa Caldera

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Journal Article
Journal: Economic Geology
Published: 01 August 2000
Economic Geology (2000) 95 (5): 1155–1164.
.... The Spahievo ore district, Bulgaria, is adjacent to the Oligocene Borovitsa caldera, one of the largest in Europe. Juxtaposition of porphyry mineralization, barren advanced argillic alteration, and low-sulfidation epithermal alteration and mineralization zones along the caldera margin provides an uncommon...
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Journal Article
Journal: Economic Geology
Published: 01 August 2003
Economic Geology (2003) 98 (5): 1029–1037.
... suggested by Albinson and Parrilla (1988) for the Real de Guadalupe district, in Guerrero state. In some epithermal Au-Ag deposits, such as Round Mountain, Nevada ( Henry et al., 1997 ), and in the Borovitsa caldera, Bulgaria ( Singer and Marchev, 2000 ), volcanism and mineralization are nearly...
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Journal Article
Journal: Economic Geology
Published: 01 June 2013
Economic Geology (2013) 108 (4): 691–718.
... ). A second cooling (or local reheating?) event affected the south-central part of the Central Rhodopian dome between 30 and 15 Ma ( Wuethrich, 2009 ). Magmatic and hydrothermal activity in the Borovitsa caldera east of the Central Rhodopian dome ( Fig. 1 ) has been dated by Singer and Marchev (2000...
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Journal Article
Published: 27 October 2009
Geological Magazine (2010) 147 (3): 321–338.
... (Ivanova, 2005 ) and Borovitsa/Murga/Dushka calderas (Dhont et al . 2008 ). These calderas also formed during phases of acidic volcanism (trachyrhyodacitic to rhyolitic) in the Early Oligocene (34–30 Ma; Dhont et al . 2008 ), accompanied by the intrusion of high-K rhyolite domes, dykes and subvolcanic...
Journal Article
Journal: Economic Geology
Published: 01 November 2010
Economic Geology (2010) 105 (7): 1335–1349.
... be genetically related. Short-lived hydrothermal systems have been interpreted based on high resolution 40 Ar/ 39 Ar studies for the epithermal Au veins in Borovitsa caldera in southern Bulgaria (~100 to ~500 ka; Singer and Marchev, 2000 ), Round Mountain in Nevada (<50 ka; Henry et al., 1997 ), Cerro...
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Journal Article
Journal: Clay Minerals
Published: 01 June 2011
Clay Minerals (2011) 46 (2): 279–294.
... into the mordenite tuffs ( Fig. 7 ). The mordenite rocks at Mezek (ER) are within the region of the Sheinovets caldera ( Aleksiev et al. , 2000 ; Ivanova et al. , 2001 ) and are also influenced by later rhyolite bodies. At one site in this region erionite has been found together with mordenite ( Ivanova et al...
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Series: Geological Society, London, Special Publications
Published: 01 January 2002
DOI: 10.1144/GSL.SP.2002.204.01.09
EISBN: 9781862394520
... to high-K calc-alkaline rocks dominated by latites. Burchina quartz latites are the youngest volcanic rocks. They are overlain by another tephrostratigraphic marker, Borovitsa rhyolite tuff, which is an outflow tuff originated from Borovitsa caldera located 20 km WNW of Madjarovo ( Singer & Marchev...
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