 | | Report (issue) | | Saddleback (FigJa), The mine lies in the narrow valley of Grainsgill Heck, a tributary of the River Caldew...and a rough track continues farther up the Caldew valley, but otherwise the high relief and rough terrain...is of lower Ordovician (Arenig-Llanvirn)age. outcrops are mainly affected by upright, open folding...uppermost parts of the granite, locally altering it to greisen. Itwas supposed that the fluids were expelled upwards...significantly higher than other cupolas in the Caldew valley and Sinen Gill, The main objective of the work |  | Breiter, Karel, Ďurišová, Jana, Korbelová, Zuzana, Vašinová Galiová, Michaela Vašinová, Hložková, Michaela (2023) Granite Pluton at the Panasqueira Tungsten Deposit, Portugal: Genetic Implications as Revealed from New Geochemical Data. Minerals, 13 (2) 163 doi:10.3390/min13020163 | Journal (article/letter/editorial) | | recovered from exploration boreholes and granite/greisen outcrops at the Panasqueira world-class tungsten deposit...markedly drop at a transition from the unmineralized greisen body to quartz veins. The W deposit was formed...Panasqueira granite pluton, including the cupola-like greisen body and its importance for vein-type tungsten...2023, 13, 163 3 of 35 The Panasqueira granite/greisen cupola rises to the level of ca. 650 m above sea...hydrothermally metasomatized to quartz ± muscovite greisen, passing upwards to a nearly pure quartz cap. Locally |  | | Report (issue) | | complex, >1500 Ma) and formed primary deposits as greisen caps, veins, and greisenized gneiss in a shallow...alluvial sediments. The placer deposits begin on the greisen cap or vein as eluvial material and grade outward...series of biotite and hornblende gneisses. Several greisen types, which exhibit the effects of various degrees...cassiterite-rich greisen in the core of the ore body contained pods with up to 20% tin. These greisen pods grade...mineralized muscovite greisen and then further outward into a quartz-rich greisen. Cassiterite occurs along |  | | Report (issue) | | southwest part of the ring structure. Two of these outcrops are thoroughly greisenized; these quartz-cass...a reconnaissance exploration technique in Long Valley, California: Journal of Geophysical Research, v... AMI sounding (F-10) between Silsilah tin greisen outcrops 10 1000 \ I I I I RESISTIVITY (ohm-m) |
|
