Abstract
The Ibaragi granitic complex comprises four rock types, that is, (I) medium-grained quartz diorite, (II) medium-grained adamellite, (III) fine-grained porphyritic granite and (IV) fine-grained adamellite. These granitic rocks intruded into Paleozoic formations successively from type I to IV in the late Cretaceous age. Zircon crystals from these granitic complex have been studied on their crystal habit, length along the c-axis and breadth along the a1 or a2 axis. A crystal habit which has two prisms and one pyramid increases towards the later intrusion. A growth trend of zircon populations is indicated by the “a” value, that is, ratio of standard deviation of length by that of breadth. The “a” value decreases towards the later intrusion. The metamict zircon is most abundant in the fine-grained adamellite that is the latest intrusive rocks. Parameters such as crystal habit or “a” value vary continuously with the characters of the host rocks.
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