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三沙永乐龙洞洞内侧壁礁体矿物和元素组成及其晚更新世以来的形成演化
罗珂1, 田元1, 傅亮2, 孙晓霞1, 毕乃双1, 范德江1, 杨作升1
1.中国海洋大学海底科学与探测技术教育部重点实验室 青岛;2.三沙航迹珊瑚礁保护研究所 三沙
摘要:
三沙永乐龙洞位于我国南海西沙群岛永乐环礁中的晋卿岛和石屿之间的珊瑚礁礁盘之中,其深度在300m左右,是目前全球已知最深的海洋蓝洞。使用X射线粉晶衍射仪、X射线荧光光谱仪、AMS14C测年等对采自不同深度的洞壁礁体进行了矿物物相、元素含量、历史年龄的研究。研究结果表明:三沙永乐龙洞洞内侧壁矿物均属于碳酸盐矿物,包括文石、高镁方解石和低镁方解石。它们主要来自钙质生物碎屑,平均含量分别为49.0%、46.6%、14.3%;洞内侧壁的主要元素是Ca、Mg、Sr,平均含量分别为36.8%、0.98%、0.48%。三沙永乐龙洞是一个复合体,17m以上岩石年龄晚于7.5cal yr BP,是全新世海平面上升时期形成的现代珊瑚礁体,没有经历过海平面下降引起的成岩作用;17m-35m岩石形成时代早于25cal yr BP,是经历了大气淡水成岩作用的晚更新世喀斯特溶洞,且在高海平面时期于17-23m以浅的空间内广泛发育洞内珊瑚礁。
关键词:  三沙永乐龙洞  珊瑚礁  矿物和元素组成  测年  成因
DOI:10.11693/hyhz20190100011
分类号:
基金项目:中央高校基本科研业务费项目(编号:201762038)和三沙航迹珊瑚礁保护研究所航迹南海海洋科研发展项目(编号:HJLD17-01)
MINERALS AND ELEMENTAL COMPOSITION OF REEFS IN THE INNER WALL OF SANSHA YONGLE BLUE HOLE AND ITS FORMATION AND EVOLUTION SINCE LATE PLEISTOCENE
LUO Ke1, TIAN Yuan1, FU Liang2, SUN Xiao-Xia1, BI Nai-Shuang1, FAN De-Jiang1, YANG Zuo-Sheng1
1.Key Laboratory of Submarine Geosciences and Prospecting Technique,Ocean University of China,Ministry of Education;2.Sansha Trackline Institute of Coral Reef Environment Protection
Abstract:
Sansha Yongle blue hole is located in the Yongle coral atoll between Xisha Islands, Jinle Island and Shiyu. Being deeper than 300 m,Sansha Yongle blue hole is the deepest marine blue hole in the world. The mineral phases, elements content and age of the cave reefs sampled from different depths of the Blue Hole were analyzed with methods of X-ray diffraction, X-ray fluorescence and AMS14C dating. The results show that the mineral composition of Sansha Yongle blue hole is single, mainly carbonate, including aragonite, high-magnesium calcite and low-magnesium calcite. They are mainly derived from calcareous bioclastics with an average content of 49.0%. 46.6%, 14.3%. The main elements are Ca, Mg, Sr, with average contents of 36.8%, 0.98%, and 0.48%, respectively. Sansha Yongle blue hole is a complex cave. The reef rock formation age above 17m is later than 7.5cal yr BP, which is a modern coral reef formed during the Holocene sea level rise, not experienced the diagenesis caused by sea level decline. The 17m-35m rock formation age is earlier than 25cal yr BP, which is a late Pleistocene karst situation that has undergone atmospheric freshwater diagenesis, and extensively develops coral reefs in shallow spaces at 17-23 m during high sea level.
Key words:  Sansha Yongle blue hole  coral reef  mineral and elemental composition  AMS14C dating  formation
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