C and O isotopic data demonstrate that these gases are derived from the felsic magma system;
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2. 在组分活性方面，镁铁质组分比长英质组分的活动更为明显。
As to the activity of the components, the mafic component is more active than the felsic component.
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3. 矿床的成矿时间、空间及其成因与长英质次火山岩关系密切；
The metallogenic time, space and genesis of the ore deposit is related closely to felsicsubvolcanic rocks.
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4. 长英质矿物早于黑云母和石榴子石结晶与岩浆侵位浅（结晶压力低）相关。
Earlier crystallization of felsic minerals than biotite and garnet is related with much lower crystallization pressure.
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5. 榴辉岩的主体围岩是长英质片麻岩，它与榴辉岩不是相同高压变质作用的产物。
Both the eclogite and the felsic gneiss have not undergone the same high-pressure metamorphic event.
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6. 榴辉岩的主体围岩是长英质片麻岩，它与榴辉岩不是相同高压变质作用的产物。
Both the eclogite and the felsic gneiss have not undergone the same high - pressure metamorphic event.
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7. 在东秦岭前寒武系变质岩中，发育了许多Z字型叠加褶皱。它们是由近直立的片麻岩和长英质脉形成的。
Z-shaped superposed folds formed by nearly vertical gneiss and feldspar-quartz veins are widely developed in East Qinling Precambrian metamorphic rocks.
Garnet pyroxenite occurs as lenses in granulite-facies metamorphic granitic gneiss and pelitic schist in the Namjagbarwa Group-complex of the eastern Himalayan tectonic syntaxis.
These reactions involving melt are not only controlled by PT conditions, but also genetically associated with dehydration melting, partial melting of felsic minerals in host rocks.
The results of composition analyses show that Ningcun china stone is mainly composed of quartz, sericite and feldspar; iron is contained in silicate, sulphide, oxide and hydroxide minerals.
The quartz-mica schist, quartzite and marble were metamorphosed sedimentary rocks, and, together with paragneiss and mafic rock, constituted the old supracrustal series.
The Fuping-time gneiss in the Taishan area, consisting of tonalite gneiss and trondhjemite, formed in NW zonal distribution in the amphibolite -facies temperature and pressure environment.
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13. 长 英 质 的变种照例具有中等至伟晶的粒度。
Aplitic varieties are the rule, with the grain size ranging from medium to pegmatitic.
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14. 长 英 质 的变种照例具有中等至伟晶的粒度。
Aplitic varieties are the rule, with the grain size ranging from medium to pegmatitic.
