New Data on Cenozoic Subalkaline Rocks of Eastern Iran

摘要

The Baluchestan and Sistan territory of eastern Iran is interesting in terms of geology, but it remains poorly studied for political and geographical reasons. This territory was investigated at the end of the 1990s by a geological team headed by A. Hushmand-Zadeh, M.A.A. Nogol Sadat, and E.F. Romanko. The subme-ridional East Iran Zone and western part of the Afghan Block (Helmand Depression) were previously thought to be composed of sedimentary rocks with sharply subordinate igneous rocks (figure), and the role of igneous rocks appeared to be substantially higher. The present communication offers new data on the insufficiently investigated subalkaline volcanics developed among the dominant thick calc-alkaline volcano-plutonic sequences.