• 作者： 汪中和；彭宗仁；陳佩芬
• 作者服務機構： 中央研究院地球科學研究所
• 中文摘要： 本研究分析了在恆春半島出露的晚更新世四溝層內貝類化石碳氧同位素的組成。從X光繞射分析、碳氧同位素 的數據、以及野外的產狀均顯示四溝層內貝類化石的保存度非常好。 四溝層內貝類化石碳氧同位素的組成範圍?：δ18O,-2.36%o?1.62%o;δ18C, -3.26%o?3.08%o。穩定數同位素的據清楚的指出：四溝層不但形成於冰期，而且是在一個受到淡水影響的濱海環境裡。碳十四定年的數據亦指出四溝層形成於氧同位素地層學的第三期中，與穩定同位素的數據吻合。 從四溝層的年代及高度所計算出的構造上升率與恆春半島全新世的速率一致，表示自四萬五千年以來恆春半島一直以相當穩定且快速的速率在上升。
• 英文摘要： Oxygen and carbon isotopic compositions have been determined in fossil molluscan shells from the late Pleistocene Szekou Formation of southern Taiwan. These fossil mollusks have been well-preserved, based on evidence of x-ray diffraction, stable isotopic data and their occurrence in the field. The following isotopic ranges were found (relative to PDB standard): δ18O,-2.36%o to 1.62%o;δ13C, -3.26%o, to 2.91%o, .The stable isotopic data of fossil shells indicate that they lived in environments beginning with a pure marine one and ending with a freshwater influence. Heavier oxygen and lighter carbon isotopic ratios of these fossils relative to modern counterparts around Taiwan indicate that these fossil mollusks grew in a glacial period (oxygen isotope stage 3), as supported by the 14C dating results. The calculated mean uplift rate for the Szekou Formation shows a value (~3 mm/yr) comparable to the value of the Holocene mean uplift rate in this area, suggesting a constant uplifting since the last 45 Ka.
• 中文關鍵字： Quaternary; Hengchun Peninsular; Szekou Formation; oxygen and carbon isotopes; uplifting
• 英文關鍵字： --