摘要
利用碳氧同位素、元素比值以及鍶同位素分析採自華北平原3000年前的淡水雙殼貝Arconaia lanceolata，我們獲得殼體年際尺度以下高解析度地球化學訊號。殼體元素比值有強烈周期變化，配合δ13C資料能對貝殼的年際做明確的標定。Mg/Ca、Al/Ca、Sr/Ca、Ba/Ca比值紀錄了乾、濕季節河水化學對於諸如降雨、洪汛及沙塵暴等天氣現象的反應訊號。87/86Sr變化顯示河水的沉積物來源除了因季節性的變動外(0.7120 ~ 0.7115)，尚有另一來自系統外因洪水氾濫或者水道改變帶來的沉積物來源( ~ 0.7095)。A. lanceolat殼體生長紋紀錄每年有兩次碳酸鈣停止分泌現象分別由於夏季河水濁度提高及冬季河溫過低產生的。

Abstract
Biogenic carbonates provide important information for a better understanding of environmental changes in the past. A large fossil aragonitic fresh-water bivalve, Arconaia lanceolata, collected from Lao Heto, Hebei, PRC, has been used widely as a climatic recorder in lake basin. The dating result is 3028 years ( U-Th dating, TIMS). We analyze the shell skeleton with δ13C&δ18O, elements/calcium ratios and 87Sr/86Sr ratios individually by IRMS, LA-ICPMS and TIMS.
There is a strong correlation between elements/calcium ratios and growth band series. It suggests that some environmental factors influences between the shell annual physiological rotations and elements concentration variations in the river in similar trends. Observing the last several years elements/calcium ratio records, the mean are increased and the oscillation transition becomes rapid and huge, because of the ripe process of the shell metabolic variations.
In annual scale, the importance of δ18O variations in the river is more controlled by precipitation effect than temperature effect in monsoon climate. And there is a same δ18O variable margin trend between in river and in rainfall when the wet-dry seasons change. So the situation is controlled by summer and winter monsoon changes. Still some δ18O records distribute near 0 ‰, and it suggests there would be a sea-source to influent the variations.
Most 87Sr/86Sr ratio records indicate that the heavier 87Sr/86Sr ratio sediments in the shell are from terrigenous source. The 87Sr/86Sr ratio variations in the shell are controlled by flux and sediment transition in the river and rainfall. Beside this mix effects in the river, like the sea-source δ18O oscillation, some 87Sr/86Sr ratio records in the shell present a near sea-source average ratios. It proves that the shell growth water mass results from sea water mass or mass of sea water mixing with river water.
We communicate with isotope and elements/calcium ratio records and growth band series on the growth time axis. Shell skeleton has several information; 1.wet and dry seasons exchange in annual like present; 2.great quantity and rapid rainfall on wet season results in bringing terrigenous source sediments to the river; 3.there are two growth bands on annual develop, light and grey bands individually represent of growth stop by temperature and turbidity; 4.water mass between sea-source and none-sea-source on annual scale; 5.Sr/Ca ratio records could be use to define the annual band on shell skeleton; 6.prat of factors of trace elements distribution on shell skeleton controlled by metabolic effects.

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