CAJ | 학술논문

沱沱河盆地通天河剖面渐新世雅西措群发现一套产于湖泛过程中的柱状叠层石.通过对叠层石纹层形态和显微组构的研究,发现这些叠层石具有典型的富藻纹层和富屑纹层交替的显微结构特征,发育三级生长节律,纹层对之间渐变接触,纹层带之间间断明显.采用激光微区取样的方法,针对4块样品的8个纹层对,系统采集了16对碳氧同位素数据,结果是富藻纹层同位素值整体上均高于富屑纹层.正相关性明显.这表明富藻纹层生长时期气候炎热湿润,富屑纹层生长时期相对寒冷干燥.认为湖相叠层石生长受周期性气候变化的控制,其韵律纹层记录了丰富的古气候信息.
타타하분지통천하부면점신세아서조군발현일투산우호범과정중적주상첩층석.통과대첩층석문층형태화현미조구적연구,발현저사첩층석구유전형적부조문층화부설문층교체적현미결구특정,발육삼급생장절률,문층대지간점변접촉,문층대지간간단명현.채용격광미구취양적방법,침대4괴양품적8개문층대,계통채집료16대탄양동위소수거,결과시부조문층동위소치정체상균고우부설문층.정상관성명현.저표명부조문층생장시기기후염열습윤,부설문층생장시기상대한랭간조.인위호상첩층석생장수주기성기후변화적공제,기운률문층기록료봉부적고기후신식.
A group of lacustrine stromatelites growing in the process of the flooding lake is discovered in the Oligocene Yaxicuo Group of Tongtianhe section,Tuotuohe Basia.The shape patterns and microstructure of stromatolite laminations show the rhytm demonstrated by microbial micrite Layers(dark layers) and grain-rich layers(1ight Layers),three-level growth rhythm,gradational contact reLation in the middle of the couplet while abrupt in the lamina growth bands.16 pairs of carbon and oxygen isotopic data are collect-ed systematically from 8 couplets of 4 samples.The value in microbial micrite Layers ale on the whole higher than in gram-rich layers,showing positive correlation.It's showed that the climate Was hot and wet in the growth period of dark layers,while colder and drier in the growth period of light layers.The haustrine stromatelites are controlled by periodic climate change,which preserve plentiful pa-leoclimate informations.