本研究以北越下龍灣地區之現生貝類殼體碳氧同位素數值與海溫紀錄比 較，探討其與水體環境之相關性，並與Đầu Rằm遺址出土之貝類殼體碳氧同 位素紀錄比較，以得知4000年前此區之氣候概況及Đầu Rằm遺址人類之貝類 採集活動季節。
經X-ray繞射分析及碳氧同位素分析結果，顯示粗紋蜑螺殼體因非單一 礦物組成，較不適用於重建古環境；而血蚶殼體Sr/Ca值可能受生機效應影 響，無法單純反映海水溫度，是否可用於古環境重建仍待進一步研究。在取 樣密度選擇的測試中，以5 mm為間隔取樣可達到接近3 mm為間隔取樣之結 果，顯示此二取樣密度對分析結果影響不大。
由現生殼體分析結果可知，珠螺、瘤珠螺、血蚶殼體之碳氧同位素與海 溫有良好的對應關係，可反映其生活水體環境之特徵，並用以判斷貝類死亡 季節。將此生長模式應用於Đầu Rằm遺址出土之貝類殼體碳氧同位素紀錄，
顯示Đầu Rằm遺址人類之貝類採集活動全年皆有，但血蚶可能主要採集於春 夏之交，珠螺、瘤珠螺、草蓆鐘螺則主要採集於夏、冬二季。
將珠螺、瘤珠螺與血蚶殼體之夏、冬氧同位素極值分別比較，古代螺
類殼體氧同位素極小值之平均較現生螺類殼體重0.36‰，極大值之平均則
二者無顯著差異；古代血蚶殼體氧同位素極大值之平均較現生血蚶殼體重 1.31‰，極小值之平均則二者無顯著差異，但數值分佈範圍較廣。本研究結 果顯示四千年前下龍灣地區夏季海溫約較現今低1.5°C，且淡水來源變化較 大，而冬季海溫則未有降溫情況發生，但氣候可能更為乾旱，或是降雨來源 有所改變。整體而言，四千年前的北越下龍灣地區可能處於較不穩定的氣候 狀態。
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附錄一、下龍灣地區現生貝類殼體碳氧同位素分析數值
樣本編號 對殼緣距離
樣本編號 對殼緣距離
樣本編號 對殼緣距離 (mm)
對殼頂/殼喙距離
(mm) d13CVPDB
(‰) d18OVPDB (‰) HLBTgR4
HLBTgR4_01 0 30 -9.28 -5.93
HLBTgR4_02 5 25 -6.79 -4.38
HLBTgR4_03 10 20 -8.97 -7.25
HLBTgR4_04 15 15 -7.95 -6.03
HLBTgR4_05 20 10 -7.41 -5.34
HLBTgR4_06 25 5 -7.18 -4.83
HLBTgR4_07 30 0 -7.41 -5.01
附錄一 (續)
附錄二、 Đầu Rằm遺址貝類殼體碳氧同位素分析數值
附錄二 (續)
樣本編號 對殼緣距離
樣本編號 對殼緣距離
樣本編號 對殼緣距離
附錄二 (續)
附錄二 (續)
附錄二 (續)
附錄二 (續)
樣本編號 對殼緣距離
附錄二 (續)
附錄二 (續)
附錄三、 Đầu Rằm遺址血蚶殼體鍶鈣分析數值
DRTgL1_OES01 0 75 85 1.37
DRTgL1_OES02 5 70 80 1.30
DRTgL1_OES03 10 65 75 1.65
DRTgL1_OES04 15 60 68 1.56
DRTgL1_OES05 20 55 64 1.14
DRTgL1_OES06 25 50 59 1.37
DRTgL1_OES07 30 45 53 1.40
DRTgL1_OES08 35 40 48 1.06
DRTgL1_OES09 40 35 42 1.61
DRTgL1_OES10 45 30 36 1.07
DRTgL1_OES11 50 25 30 1.32
DRTgL1_OES12 55 20 25 1.33
DRTgL1_OES13 60 15 19 1.54
DRTgL1_OES14 65 10 12 1.41
DRTgL1_OES15 70 5 6 1.52
DRTgL1_OES16 75 0 0 1.76
DRTgL2
DRTgL2_OES01 0 60 68 1.08
DRTgL2_OES02 5 55 62 1.15
DRTgL2_OES03 10 50 56 1.40
DRTgL2_OES04 15 45 51 1.10
DRTgL2_OES05 20 40 45 1.53
DRTgL2_OES06 25 35 39 1.14
DRTgL2_OES07 30 30 34 1.43
DRTgL2_OES08 35 25 28 1.61
DRTgL2_OES09 40 20 23 1.58
DRTgL2_OES10 45 15 17 1.33
DRTgL2_OES11 50 10 11 1.21
DRTgL2_OES12 55 5 5 1.60
DRTgL2_OES13 60 0 0 1.24