<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31457322</termId><termName>quartz porphyry</termName><termType>PT</termType><termNote><![CDATA[ A porphyritic rhyolite containing phenocrysts of quartz and alkali feldspar in a microcrystalline or cryptocrystalline groundmass. ]]></termNote><termCreatedDate>2026-03-30 21:03:05</termCreatedDate><relation><relationType>UF</relationType><termId>31457323</termId><termName>porphyry, quartz</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31457324</termId><termName>quartz-porphyry</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31438503</termId><termName>rhyolite</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31438515</termId><termName>porphyry</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31471228</termId><termName>elvan</termName><termType>PT</termType></relation></term>  </Zthes>