摘要
苏北榴辉岩至少存在高压壳源型（Ｈ型）、超高压壳源型（Ｕ型）和幔源型（Ｍ型）三类。其中Ｈ型榴辉岩的石榴石为铁铝榴石，具正环带结构，单斜辉石属低硬玉绿辉石，主要形成于晋宁期低温高压变质条件下的下地壳；Ｕ型榴辉岩含微粒金刚石（？）、柯石英及其假象等，发育放射状胀裂结构和正、反环带结构，石榴石为钙铝榴石，单斜辉石属高硬玉绿辉石，主要形成于印支期高温超高压变质条件下的上地幔；Ｍ型榴辉岩的石榴石属镁铝榴石，形成于晋宁期高温超高压条件下的岩石圈与软流圈交界附近。
The eclogites in northern Jiangsu have at least three types:high pressure crustal type (H_type), ultrahigh pressure crustal type (U_type)and mantle type (M_type).The eclogites of H_type were mainly formed in the lower crust through the low_temperature and high_pressure metamorphism of Jinning orogeny. The eclogites of U_type contain micrograined diamond, coesite and pseudocoesite and exhibit tension crack texture and normal or inverse zoning structure. The garnets consist mainly of grossular and the clinopyroxenes comprise chiefly omphacite of high jadeite, formed in the upper mantle under megatemperature and ultrahigh pressure of Indosinian orogeny. The garnets of M_type belong to pyrope mainly formed near the boundary between lithosphere and aesthenosphere under the megatemperature and ultrahigh pressure of Jinning or earlier orogeny.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
1998年第2期118-127,共10页
Acta Petrologica et Mineralogica
