Zircons collected in Precambrian metamorphic rocks from Wuyang district, Henan province, were studied and their characteristic patterns are used to reconstruct the original rocks of metamorphic rocks under investigation. Thus the results obtained are satisfactory, especially in such fields as the differentiation between the amphibolites and plagioclase amphibolites metamorphosed from igneous rocks and that from sedimentary rocks. Based upon the characteristic patterns of zircons a lithological classification of the original rocks is suggested for the Precambrian metamorphic rocks.
. CHARACTERISTIC PATTERNS OF ZIRCONS IN THE PRECAMB-RIAN METAMORPHIC ROCKS FROM THE WUYANG DISTRICT, HENAN PROVINCE, AND THEIR APPLI-CATION IN RECONSTRUCTING THE ORIGINAL ROCKS[J]. Chinese Journal of Geology, 1980, 15(3): 242-248.