dacite


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  • noun

Words related to dacite

a grey volcanic rock containing plagioclase and quartz and other crystalline minerals

References in periodicals archive ?
Abitibi in Canada) with volcanic, intrusive and sedimentary rocks of the Archaean (Nyanzian) system, Kavirondian sediments, and younger felsic to intermediate intrusions varying in composition (granite, dacite, granodiorite, diorite) and often multiphase.
Contact metamorphic features in the East Bay Hills dacite, including hornfelsic texture and pyrite mineralization, were previously reported by Barr et al.
In western North America, dacite stone tools and the 'reduction flakes' produced during their manufacture (shown here) represent the most ubiquitous artifacts associated with archaeological sites in this area.
This new zone is hosted in a dacite unit, which typically has been barren but this intersection and the one in hole NB-13-361 in the Yellowjacket deposit 700 metres to the east are changing that assumption.
The plutons, dykes, and sills of the Charlo plutonic suite consist of varied intermediate to felsic rock including quartz monzonite to monzogranite, quartz-plagioclase rhyolite porphyry, hornblende dacite porphyry, and felsite.
In addition, researchers found that the magma is made of dacite, a type of rock that's a precursor to granite, rather than the basalt that forms most of Hawaii.
latite ("PPQL"), and dacite ("PPDC") porphyry dykes.
The supracrustal (greenstone) belts are lithologically diverse and include basalt, greywacke, pelite, and iron formation, along with lesser andesite, dacite, rhyolite, ultramafic rocks, conglomerate, and carbonate rocks.
The primary exploration target within the Orofino Project is bulk tonnage heap leachable gold and silver mineralization within quartz-carbonate veins, shears and structurally controlled breccias hosted in andesitic to dioritic volcanic rocks and associated with dacite dykes and sills.
0 m depth, DDH NEV 18 penetrated feldspar porphyries of mixed volcanic and intrusive origin of the Nevera Igneous Complex, a dacite dome making up an integral part of the Pliocene to Recent Crater Mountain Volcanics which were intruded into and overlie the Mesozoic Chim Formation regional basement.
The columns are now interpreted as dacite pipes that cut through the older rocks in the last stages of volcanic activity.
The upper part of the Porten Road Formation comprises an interlayered sequence of quartz-rich rhyoLite and quartz-poor dacite.
The primary exploration target within the Orofino Project is bulk tonnage heap leachable gold and silver mineralization with quartz-caarbonate veins within shears and structurally controlled breccias hosted within andesitic to dioritic volcanics associated with dacite dykes and sills.
The mineralization is hosted within a tuffaceous dacite that outcrops on a northeast trending ridge for approximately 1km.
Broad (6 m wide) zones of silicification in dacite intrusive were intersected carrying weakly anomalous gold (0.