CAJ | 학술논문

西藏改则热那错地区位于南羌塘盆地南缘，在该区发育了一套厚度较大的碳酸盐岩沉积。对该区碳酸盐岩 C、O稳定同位素的研究，可以恢复其形成的古环境及沉积特征。在野外剖面测制（1∶2000）、样品系统采集的基础上，对其碳酸盐岩进行 C、O 同位素的测试及分析，结果表明：西藏改则热那错地区古海水盐度 Z 值为126.32～135.37，属正常海水-超咸水；古海水温度平均值为22.4℃，代表温暖的气候环境；δ18 O、δ13 C 值均随海平面的变化而变化，海水越深，δ18 O 值越大。根据 C、O 同位素计算出的古温度、古盐度与所划分的沉积相带是相互对应的。
서장개칙열나착지구위우남강당분지남연，재해구발육료일투후도교대적탄산염암침적。대해구탄산염암 C、O은정동위소적연구，가이회복기형성적고배경급침적특정。재야외부면측제（1∶2000）、양품계통채집적기출상，대기탄산염암진행 C、O 동위소적측시급분석，결과표명：서장개칙열나착지구고해수염도 Z 치위126.32～135.37，속정상해수-초함수；고해수온도평균치위22.4℃，대표온난적기후배경；δ18 O、δ13 C 치균수해평면적변화이변화，해수월심，δ18 O 치월대。근거 C、O 동위소계산출적고온도、고염도여소화분적침적상대시상호대응적。
The Renacuo area of Gaize,Tibet,in the southern Qiangtang Basin,shows a series of strikingly thick carbonate layers.Research on C and O isotopes in the area plays an important role in the reconstruction of the paleoenvironment and the identification of the sedimentary characteristics.Based on the geological map of the lithostratigraphy (1∶2,000),the numerous samples collected in the field and analysis of the C and O isotopes, the Z values of salinity from 126.32 to 135.37,which indicates that the paleoseawater in the Renacuo area of Gaize ranges from normal marine to hypersaline.In addition,the average temperature of the paleoseawater is 22.4 ℃,firm evidence of a warm climate.Both the rates of δ18 O and δ13 C vary with respect to the sea level:the deeper the seawater,the higher the δ18 O.The paleotemperature and paleosalinity from the determination of C and O isotopes closely reflect the related sedimentary facies.