礼乐盆地碳酸盐岩时空分布特征及构造意义
作者简介:徐东海(1989—), 男, 硕士研究生, 主要从事海洋构造地质与沉积响应研究。E-mail:donghaixu@outlook.com
收稿日期: 2018-01-15
网络出版日期: 2018-12-24
基金资助
国家自然科学基金-广东联合基金(U1301233);广东省自然科学基金研究团队项目(2017A030312002);南部区域地质调查项目(DD20160138-04)
Spatial and temporal distribution characteristics of carbonates in Liyue Basin and their tectonic implications
Received date: 2018-01-15
Online published: 2018-12-24
Supported by
National NSFC & Natural Science Foundation of Guangdong Province (U1301233);Natural Science Foundation of Guangdong Province (2017A030312002);Marine geological survey of southern South China Sea (DD20160138-04)
Copyright
对碳酸盐岩(台地与生物礁)的研究具有重要的油气地质意义和科学价值。渐新世以来, 礼乐盆地及周缘开始了大规模的碳酸盐建造, 至今还有一定规模生物礁持续发育。文章通过拖网约束、井震对比和地震相类比方法对礼乐盆地周缘碳酸盐岩的发育特征、构造背景和时空分布规律进行系统研究。结果表明, 礼乐盆地主要发育孤立、前隆、掀斜断块型台地及生物礁。碳酸盐岩时空发育特征为: 1) 渐新世—早中新世以构造前隆和掀斜断块控制的开阔台地为主, 生物礁零星发育; 2) 早中新世—中中新世表现为大量孤立台地和生物礁; 3) 中中新世之后, 发生台地和礁的淹没, 盆地内主要发育点礁。结合构造背景和重磁特征分析表明, 古隆起、掀斜断块、前隆迁移和岩浆活动为控制礼乐盆地不同时期碳酸盐岩发育的主要构造要素。现今礼乐盆地及周缘大量生长的珊瑚礁, 主要发育在上新世—更新世岩浆活动形成的海山之上。
徐东海 , 王利杰 , 姚永坚 , 孙珍 , 邱宁 . 礼乐盆地碳酸盐岩时空分布特征及构造意义[J]. 热带海洋学报, 2018 , 37(6) : 49 -62 . DOI: 10.11978/2018011
The study of carbonates (carbonate platform and reef) is of great significance in oil & gas productions as well as scientific research. Since the Oligocene, carbonates had been widely developed in the south margin of the South China Sea. To describe the development features, tectonic settings, and the spatial and temporal distribution characteristics of the carbonates in the Liyue Basin and its surrounding area, several multi-channel seismic lines were utilized. First, the carbonate platforms and reefs are recognized. Then, the time of the evolution of these carbonates is constrained with wells and dredged samples. The results show that the carbonate platforms can be divided into three types: isolated platform controlled by inherited basement high, tilted fault-block platform, and forebulge carbonate platform. From the late Oligocene to the early Miocene, isolated platforms and tilted fault-block platforms mainly developed, while reefs were scattered. From the early Miocene to the middle Miocene, isolated carbonate platforms and reefs were prosperous. After the middle Miocene, most of the carbonates were drowned and only patch reefs remained. The combination of tectonic background and gravity analysis shows that the ancient uplift, the rotated fault-block, the forebulge migration, and the magmatic activity are the main controlling factors in different stages during the development of the carbonates. Modern reefs built up mainly on the seamount, which was due to the volcanism in the Pliocene-Pleistocene.
Fig. 1 Locations of Liyue Basin, survey lines, wells, and dredge samples. |
Tab. 1 The dredged samples in Liyue Basin. After Kudrass et al (1986)表1 礼乐盆地拖网站位岩石样品(据Kudrass et al, 1986) |
拖网站位 | 岩性 | 年代 | 沉积环境 |
---|---|---|---|
SO23-39 | 颗粒灰岩、泥质颗粒灰岩 | 早—中中新世 | 浅海相、潟湖相 |
SO23-38 | 多孔含红藻-圆盾虫粒泥灰岩、生物碎屑粒泥灰岩 | 晚渐新世—中中新世 | 开阔浅海相 |
SO23-37 | 黏结灰岩、颗粒质泥灰岩 | 中新世 | 开阔浅海相 |
SO23-34 | 含生物碎屑泥质颗粒灰岩 | 中中新世 | 开阔浅海相 |
SO23-32 | 颗粒灰岩、内碎屑泥质颗粒灰岩、含超微化石泥灰岩 | 早—中中新世 | 开阔浅海相、半深海相 |
SO23-29 | 含有孔虫化石泥质颗粒灰岩 | 早—中中新世 | 开阔浅海相 |
SO23-20 | 黏结灰岩、泥质颗粒灰岩 | 中新世 | 礁相 |
SO23-18 | 印模粒泥灰岩 | 早—中中新世 | 开阔浅海相 |
SO23-17 | 颗粒灰岩 | 早中新世早期 | 开阔浅海相 |
SO27-16 | 印模粒泥灰岩、内碎屑泥粒灰岩 | 晚渐新世—中中新世 | 开阔浅海相 |
SO27-13 | 富红藻颗粒灰岩、泥灰岩 | 早—中中新世 | 开阔浅海相 |
SO27-14 | 生物碎屑灰岩、泥灰岩 | 早—中中新世 | 开阔浅海相 |
SO23-37 | 多孔玄武岩 | 0.4Ma | — |
SO23-38 | 橄榄玄武岩 | 0.5Ma | — |
SO23-40 | 多孔斑状玄武岩 | 2.7Ma | — |
SO27-15 | 斑状安山岩 | 14.7Ma | — |
Fig. 2 Seismic stratigraphy, lithology, and major tectonic events of Liyue Basin. Revised after Du Bois (1981) and Taylor et al (1983)图2 礼乐盆地综合地层柱状图[修改自Du Bois(1981)、Taylor等(1983)] |
Fig. 3 An example of seismic features, gravity, and magnetic characteristics of typical carbonate platforms and reefs in Liyue Basin ( |
Fig. 4 Three types carbonate platforms in Liyue Basin and their seismic reflection characteristics. |
Fig. 5 Seismic characteristics of volcano and reefs ( |
Fig. 6 Typical carbonate platform and reef in Liyue Basin along line A-A° ( |
Fig. 7 Typical identification of characteristics of carbonates in seismic section B-B′ ( |
Fig. 8 Distributions of carbonate platforms in Liyue Basin and its surrounding area. |
Fig. 9 Distributions of reefs in different stages (a, b, c) from the Miocene till now in Liyue Basin and its surrounding area (d). |
Fig. 10 The model of carbonate platforms and reefs with their tcectonic settings. |
The authors have declared that no competing interests exist.
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