玉里帶位於台灣中央山脈與海岸山脈之間，係台灣造山帶中唯一的高壓低溫（HP-LT）變質帶。傳統研究將其歸屬為中生代白堊紀產物，然而近年高精度鋯石鈾鉛定年資料顯示，其應為中新世增積稜柱，紀錄南中國海板塊隱沒及隨後弧陸碰撞演化之過程。本研究透過整合性文獻分析與統計，彙整玉里帶北、中、南段（緯度23.0°N–24.0°N）鋯石U-Pb年代學及鋯石鎦-鉿同位素資料，探討兩項主要科學問題：（1）玉里帶是否呈現造山運動南移之規律性；（2）界定玉里帶之鋯石鎦-鉿同位素特徵之物源轉換與構造邊界。
主要成果包括四個方面：
其一，基質碎屑鋯石最大沉積年代（MDA）呈現南向變年輕規律，北段約25–28 Ma、中段約11 Ma、南段約11–17 Ma。線性迴歸分析（R² = 0.897）似乎表明造山運動前緣南移速率約10.7 km/Ma（1.1 cm/yr），低於現今板塊斜向遷移速率，可能反映碰撞初期造山前鋒遷移較緩，初步驗證台灣斜向碰撞模式。
其二，外來岩塊火成結晶年代全帶相近，均集中於15–17 Ma。鎦-鉿同位素呈較高正值（εHf(t) = +14至+30），與呂宋島弧特徵（+5至+13）存有差異，似反映其源自虧損地函，與南中國海洋殼來源較為相符。南、北段εHf(t)值之數值差異可能暗示源區複雜性，需進一步檢驗。
其三，多系統冷卻年代整合顯示玉里帶經歷約15Ma演化循環：（a）南中國海洋殼生成期（~15–17 Ma），由鋯石核心結晶年代代表；（b）隱沒-冷卻期（~12–9 Ma），由礦物Ar-Ar年代所示；（c）弧陸碰撞-快速折返期（<4 Ma），鋯石邊緣變質年代3.3 Ma標記碰撞期高壓流體改造，隨後快速抬升（3–6 mm/yr）。此框架協調了前人矛盾的年代資料。
其四，基質（負εHf，陸殼成分）與岩塊（正εHf，洋殼成分）之同位素二元特徵，似可支持玉里帶為典型構造混同層（Tectonic Mélange）之解釋，基質與岩塊源自不同構造環境，於隱沒過程中混合。
結論： 本研究傾向支持「中新世晚期增積、上新世碰撞抬升」之認識，相較於支持玉里帶為中生代古太平洋隱沒之傳統看法。此外，重新定位將台灣造山帶演化與南中國海張裂-閉合歷史相互關聯，可望為西太平洋弧陸碰撞動態與斜向碰撞機制提供整合性資訊。進一步研究倘能納入更多高精度同位素資料與變質相平衡分析，應可更精確量化隱沒深度、峰值變質條件與折返速率之時空變異。

The Yuli Belt represents Taiwan's sole high-pressure, low-temperature (HP-LT) metamorphic terrane. Although conventionally attributed to Cretaceous subduction, recent zircon U-Pb geochronology indicates it is a Miocene accretionary prism recording South China Sea subduction and arc-continent collision. This study integrates zircon U-Pb and Lu-Hf isotopic data from the northern, central, and southern segments (23.0°N–24.0°N) to address systematic orogen-front migration and Lu-Hf provenance signatures.
Four major findings emerge: First, detrital zircon maximum depositional ages (MDA) show systematic southward rejuvenation—northern segment ~25–28 Ma, central ~11 Ma, southern ~11–17 Ma. Linear regression (R² = 0.897) indicates a southward migration rate of ~10.7 km/Ma, lower than present-day plate convergence (8–9 cm/yr), suggesting deceleration during initial collision and preliminarily validating Taiwan's oblique collision model.Second, exotic blocks (metamorphosed ophiolite, gabbro, plagiogranite) yield crystallization ages of 15–17 Ma with elevated positive εHf(t) values (+14 to +30), contrasting with Luzon arc signatures (+5 to +13). This may indicate depleted mantle derivation consistent with South China Sea oceanic crust. Differences between southern and northern segments suggest source complexity warranting further investigation.
Third, integration of zircon U-Pb and ⁴⁰Ar/³⁹Ar ages reveals a ~15 million-year evolutionary cycle: oceanic lithosphere genesis (~15–17 Ma), subduction-cooling (12–9 Ma), and arc-continent collision with rapid exhumation (<4 Ma), marked by zircon rim ages of 3.3 Ma and uplift rates of 3–6 mm/yr.Fourth, the matrix exhibits negative εHf(t) values (TDM2 > 2.0 Ga) indicating Cathaysia Block components, while exotic blocks display positive Lu-Hf characteristics reflecting mantle sources. This isotopic dichotomy supports a classic tectonic mélange interpretation.The compiled data do not support Cretaceous Paleo-Pacific subduction. Instead, they indicate "late Miocene South China Sea accretion followed by Pliocene collision-driven exhumation." This repositions Taiwan's orogen evolution within South China Sea history, offering insights into western Pacific arc-continent collision mechanisms.

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