摘要
以佛坪穹隆为核心 ,(麻粒岩相 ) -高角闪岩岩相 -低角闪岩相变质相带呈同心环带状依次向外展布 ;研究表明 ,其为加里东 -海西期由于地幔上隆导致基底减压深熔而形成局部隆起 ,并引起上部盖层分层剪切 -滑脱作用过程变质作用所发生 ;变质峰期温、压力分别可达 82 9℃和 0 .75 Gpa。但变质峰期滞后于变形峰期。在变质变形过程中基底的隆升幅度可达 7km～ 8km。反映主造山前隆
The metamorphic zones of granulitic facie s-high amphibolite facies-low amphibolite facies are distributed at concetric rings from the center to outside around the Foping dome Researches have indicated tha t the result was formed by mantle doming during the Hercynain and Caledonian per iods, thus resulting in the decrease of pressure in basement and forming domes i n localities, which caused the metamorphism occurring in the process of cover-b edding shearing-decollement. During the intensive period of the metamorphism, t he temperature. and pressure could be up to 829℃ and 0.75 Gpa. The intensive pe riod of metamorphism occurred later than that or deformation. In the period of m etamorphism and deformation, the upwarped range of basement could be up to 700 m or 800 m ,which reflecting that the uplift and decollement structures before t he orogenic period are important in evolution the complicated orogenic zones.
出处
《矿物岩石》
CAS
CSCD
北大核心
2000年第2期86-90,共5页
Mineralogy and Petrology
