7 research outputs found
Mechanisms of Ar release from Himalayan metamorphic hornblende
Get PDFChanges in hornblende samples that occur during stepwise 39Ar/40Ar analysis were studied
experimentally and mineralogically. A complex succession of reactions was seen (hornblende
~ oxyhornblende ~ clinopyroxene-structured phase ~ fine-grained reaction products
~ glasses) in the temperature range 750-1300 °C. The release of Ar from hornblende
in the vacuum furnace appeared to occur by fundamentally different processes from those
resulting in Ar loss during metamorphism. Simple diffusional interpretations of the release patterns are, therefore, not capable of revealing the thermal history of samples. In principle, some useful information may be obtained if long-standing fractures andother defects control both natural Ar loss and mineral reactions within the laboratory
40Ar/39Ar whole-rock ages and structural data from the western the Kii peninsula (western Japan): implications for extension and exhumation of the Mikabu and Sambagawa belts.
No full text40Ar/39Ar whole-rock ages of the Sambagawa belt from western the Kii peninsula, (Wakayama Prefecture): constraints on the timing of accretion and reactivation along the Aridagawa tectonic line.
No full textThe Feasibility of Transitioning Low-density Suburbs into Healthy Walkable Neighbourhoods: The Case of Adelaide, South Australia
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