Abstract
ć秊ćČé 汱枊äžćčżæłćșéČçæ©ć€ç代è±ćČćČ©ćć ¶äžçćșæ§æèäœïŒćŻčäșèźšèźșèŻ„é 汱枊æ©ć€ç代ć°ćŁłćæé æŒćèżçšć ·æéèŠç 究æäčăæŹææ„éäșäžčć€ć°ćșæŁćäșéżè±ćČćČ©ćć ¶äžçæéżèŸçłćČ©æèäœäžé»æćČćČ©äœäžçæéżè§éȘćČ©æèäœçć šćČ©ć°çććŠćéçłU-Pb-Hf-OćäœçŽ ç»æăæéżè§éȘćČ©ćæéżèŸçłćČ©éçłU-PbćźćčŽè·ćŸäș493±8MaććČ©ćčŽéŸć468±4Ma~460±5Maçè§éȘćČ©çžć莚ćčŽéŸăéçłU-PbćźćčŽèĄšææŁćè±ćČćČ©äŸ”äœäșæćżçäžïŒ419±4MaïŒăæéżè§éȘćČ©ćæéżèŸçłćČ©SiO<sub>2</sub>ć«éä»äș49.69%~50.73%äčéŽïŒćç°é莚ăćé莚ćéçą±æ§çčćŸïŒćŻé性犻ćäșČçłć çŽ ïŒLILEsïŒć蜻çšćć çŽ ïŒLREEïŒïŒäșæé«ćșćŒșć çŽ ïŒHFSEsïŒïŒćč¶äžć€§éšćéçłć ·æèŸé«ç<i>Δ</i><sub>Hf</sub>ïŒ<i>t</i>ïŒćŒïŒ-0.3~7.5ïŒćéçł<i>ÎŽ</i><sup>18</sup>OćŒïŒ5.61â°~8.20â°ïŒăèżäșçčćŸæç€șć ¶ććČ©ćŻèœæșäș俯ćČæżçäș€ä»Łçć°ćčæ„éšćçèăæŁćè±ćČćČ©SiO<sub>2</sub>ć«éäžș70.11%ïŒćç°é«çĄ çą±ïŒèŽ«ééïŒćŒ±èżéïŒćŻéLILEsćLREE仄ćäșæHFSEsççčçčïŒäžIćè±ćČćČ©çć çŽ ć°çććŠçčćŸäžèŽïŒè±ćČćČ©ć ·æèŸé«ç<i>Δ</i><sub>Hf</sub>ïŒ<i>t</i>ïŒćŒïŒ0.1~3.9ïŒć<i>ÎŽ</i><sup>18</sup>OćŒïŒ8.72â°~9.66â°ïŒăèżäșçčćŸæç€șè±ćČćČ©æŻç±èćçćčŽèœ»ć°ćŁłç»é»äșæŻè±æ°Žçèćœąæăç»ćć秊ćČé«ć-è¶ é«ćïŒHP-UHPïŒćČ©çłăæ©ć€ç代è±ćČćČ©ććșæ§ćČ©ç 究ç°ç¶ïŒèĄšæèŻ„ćșćšæ©ć€ç代ç»ć䞀ææé æŹćäș件ćč¶äŒŽééć莚ćæ·±çäœçšïŒćć«ćçćšäž-æć„„é¶äžćæćżçäžă
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