Original paper
Growth marks and genetic conditions in a quartz druse
Scandale, Eugenio; Stasi, Francesca; Graziani, Giorgio
Neues Jahrbuch für Mineralogie - Abhandlungen Band 160 Heft 2 (1989), p. 181 - 192
29 references
published: Mar 23, 1989
DOI: 10.1127/njma/160/1989/181
ArtNo. ESP154016002004, Price: 29.00 €
Abstract
Structural defects, previously recognized as growth marks (Scandale & Stasi, 1985), of quartz crystals from a druse have been related to formational conditions, minor element concentrations and optical anomalies. Pressure limit (up to 2kbar) and temperature range (193°- 390 °C) of growth medium were determined by fluid inclusions and mineralogical association of solid inclusions. Minor element concentrations were measured by electron microprobe analyses and related to differential absorption in different growth sectors. Optic Axial Plane orientations were studied. Comparison of growth-history reconstruction and chemico-physical growth conditions shows that growth marks can be differentiated in their origin and correlated to the chemical and physical conditions.
Keywords
Quartz druse • optical anomalies • minor element concentrations • inclusions • X-ray diffraction topography • growth history • growth marks • growth defects • formational conditions • Tornadri (Italy)