CAJ | 학술논문

砂岩中重矿物在埋藏成岩环境中会发生溶蚀甚至形成新的重矿物胶结物。利用重矿物特征进行物源分析是鄂尔多斯盆地上三叠统延长组物源分析的最重要方法之一，但石榴子石、榍石和绿帘石这3种重矿物在成岩作用期间发生了明显的后生变化。研究表明，延长卡中石榴子石发生溶蚀形成粒内溶孔和刻面石榴子石，部分被方解石、绿泥石或硅质交代；见自生榍石晶体及榍石次生加大，且榍石的生长具有多期次性；见自生绿帘石晶体及绿帘石次生加大，部分绿帘石被绿泥石或硅质交代；相对稳定性强的石榴子石部分被溶蚀，而相对稳定性弱的碎屑状榍石、绿帘石并未见到溶蚀现象，这与以往研究中对于重矿物稳定性的认识是不一致的，希望能引起未来研究者的重视。
사암중중광물재매장성암배경중회발생용식심지형성신적중광물효결물。이용중광물특정진행물원분석시악이다사분지상삼첩통연장조물원분석적최중요방법지일，단석류자석、설석화록렴석저3충중광물재성암작용기간발생료명현적후생변화。연구표명，연장잡중석류자석발생용식형성립내용공화각면석류자석，부분피방해석、록니석혹규질교대；견자생설석정체급설석차생가대，차설석적생장구유다기차성；견자생록렴석정체급록렴석차생가대，부분록렴석피록니석혹규질교대；상대은정성강적석류자석부분피용식，이상대은정성약적쇄설상설석、록렴석병미견도용식현상，저여이왕연구중대우중광물은정성적인식시불일치적，희망능인기미래연구자적중시。
The heavy minerals in sandstones in the burial diagenetic environment will suffer the solu-tion and even form new heavy mineral cements.Provenance analysis method by using the characteristics of heavy minerals is one of the most important methods in the Upper Triassic Yanchang Formation of Ordos Basin.However,three kinds of heavy minerals,including garnet,sphene and epidote,have changed a lot during their diagenetic stage.Garnet was dissolved and become facet garnet,some was replaced by cal-cite,chlorite or quartz.The authigenic sphene crystals and sphene overgrowth were discovered, and sphene growth had several times.Authigenic epidote crystals and epidote overgrowths were seen,part of epidotes were replaced by chlorite or quartz.Garnet with relatively strong stability was dissolved,and de-trital sphene and epidote with relative weak stability were not dissolved.This phenomenon is not consistent with knowledge of the heavy mineral stability in previous studies,and we hope it could be taken seriously by the researchers in the future.