x
uploads/veinlet.jpg

veinlet n.【解剖學】小靜脈;【動物;動物學】小翅脈;【植物;植...

veinous

Undertaking isotopic geochronological study on ar - ar , adopted the fast - neutron activation dating technique to test 40ar - 39ar age of quartz from au - bering quartz veinlet ore in the deposit , and well - defined plateau age of 210 . 59 ma ? . 92 ma , the lowest apparent age of 208 . 07 ma ? . 22 ma , and isochron age of 207 . 14 ma ? 1 . 92 ma 通過流體包裹體顯微測溫學研究,表明金礦床的均一溫度成礦早階段為270 320 ,成礦主階段為170 250 ,成礦晚階段為110 250 ,呈逐漸降低的趨勢,低溫成礦作用明顯。