| 陆相浅水湖盆米氏沉积速率制约下的高频层序?时间单元定量拾取:以西湖凹陷黄岩区花港组为例 |
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| 引用本文： | 贾悦锐,刘强虎,朱红涛,秦兰芝,徐东浩,李志垚,孙中恒.陆相浅水湖盆米氏沉积速率制约下的高频层序?时间单元定量拾取:以西湖凹陷黄岩区花港组为例[J].地球科学,2022,47(11):4020-4032. |
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| 作者姓名： | 贾悦锐 刘强虎 朱红涛 秦兰芝 徐东浩 李志垚 孙中恒 |
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| 作者单位： | 1.中国地质大学资源学院, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金项目41902112中海油科技专项CCLS2020SHPS025RSI |
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| 摘 要： | 旋回地层学的研究对象由海相地层逐渐转移到陆相深水地层.为了探究通过旋回地层学研究方法在陆相浅水湖盆建立高频层序格架的可能，采用频谱分析、天文调谐、“米氏”沉积速率拾取等手段对东海陆架盆地西湖凹陷黄岩区渐新统坳陷湖盆的岩相敏感曲线-GR数据开展研究.频谱分析结果显示黄岩区花港组受405 ka长偏心率周期（E）、121 ka和97 ka短偏心率周期（e）、28 ka斜率周期（O）以及约22 ka岁差周期（P）的调控.在浅水湖泊环境的富泥区，以La2004天文解决方案给出的65°N平均日照序列为参照进行天文调谐，建立了浮动天文年代标尺；在浅水三角洲环境的富砂区，通过滑动窗口频谱分析得到“米氏”沉积速率曲线，结合锆石铀铅测年资料的校验和岩石组合类型联合约束，完成高频层序格架划分.研究表明:黄岩区花港组持续时间约为10.9 Ma，可识别出27个405 ka长偏心率周期，根据偏心率滤波曲线和日照量各级次包络面的对应关系共划分11个四级层序，27个五级层序，分别对应着0.8~1.6 Ma和0.4 Ma的基准面旋回，每个旋回在沉积速率曲线上表现为高?低?高的特征.本次研究提供了一种利用“米氏”沉积速率进行高频层序格架搭建及层序?时间单元拾取的新方法，拓宽了旋回地层学的应用范围.
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| 关 键 词： | 西湖凹陷 花港组 陆相浅水湖盆 "米氏"沉积速率 高频层序?时间单元 沉积学 |
| 收稿时间： | 2022-04-26 |
Quantitative Pickup of High Frequency Sequence-Time Units under Restriction of Milankovitch Sedimentary Rate in Continental Shallow Lake Basin: A Case Study of Huagang Formation in Huangyan Area,Xihu Sag |
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| Abstract: | The research object of cyclostratigraphy has gradually shifted from marine strata to continental deep-water strata. In order to explore the possibility of establishing high frequency sequence framework in continental shallow lake basin by means of cyclicstratigraphy, spectral analysis, astronomical tuning and "Milankovitch" sedimentation rate picking were used to study the lithofacies sensitive curve-GR logging data of the Oligocene depression lake basin in Huangyan area of the Xihu sag, East China Sea shelf basin. The results of spectrum analysis show that the Huagang Formation in Huangyan area is regulated by 405 ka long eccentricity period (E), 121 ka and 97 ka short eccentricity period (e), 28 ka slope period (O) and about 22 ka precession period (P). Taking the 65°N average sunshine sequence given by La2004 astronomical solution as the reference for astronomical tuning, a floating astronomical chronometer scale is established in the mud-rich areas of the lake environment. In the sand-rich area of the shallow-water delta environment, the Milankovitch sedimentation rate curve was obtained through the sliding window spectrum analysis, combined with the zircon U-Pb dating data verification and joint constraints of rock assemblage type, the high-frequency sequence framework was set up. This study shows that the duration of Huagang Formation in Huangyan area is about 10.9 Ma, and 27 long 405 ka eccentricity cycles can be identified. According to the correspondence between the eccentricity filtering curve and the sub-envelope surface of sunshine amount, there are 11 fourth-order sequences and 27 fifth-order sequences, which correspond to the base level cycles of 0.8-1.6 Ma and 0.4 Ma respectively, and each cycle is characterized by high-low-high characteristics on the deposition rate curve. This study provides a new method to construct high frequency sequence framework and pick up the interface based on the "Milankovitch sedimentation rate", which broadens the application scope of cyclostratigraphy. |
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