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In order to better understand the sedimentary rate changes in the Caroline area which is located in the north of West Pacific Warm Pool, a comprehensive dating method was carried out by using radiocarbon testing(14C), oxygen isotope and paleomagnetism on a gravity core from the Caroline area of the western Pacific Ocean. 14C data provide the age of the upper section since 44.3 ka BP for this core. Subsequently, the age framework since MIS4 (about 80 ka) which corresponds to the depth of 125 cm was established by using oxygen isotope and relative paleointensity (RPI) data, while the upper part also considered the 14C data. Further analysis revealed that there was an obvious sedimentary discontinuity at the depth of 126 cm to 127 cm in this core, although it has been beyond the range of 14C dating, but the paleomagnetic results show that the core formed in Brunhes period, and the relationship between RPI and oxygen isotope data under the hiatus provide a robust evidence that the age is from 180 ka to 130 ka in the bottom. At the end the deposition rate of the core was obtained, which is 1 cm/ka to 2 cm/ka, and it is consistent before and after the deposition hiatus. At the same time, the disparity of the deposition rate for each dating method indicated that there was a large deviation of 14C data in one layer maybe due to the high rate of foraminiferal shell breaking.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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