U-series data for the Pelorus Island from Roff et al (2013) Palaeoecological evidence of a historical collapse of corals at Pelorus Island, inshore Great Barrier Reef, following European settlement. (NERP TE 1.3, UQ)

This dataset is the U-series data for Pelorus Island as described in Roff et al (2013) Palaeoecological evidence of a historical collapse of corals at Pelorus Island, inshore Great Barrier Reef, following European settlement. Proceedings of the Royal Society Series B 10.1098/rspb.2012.2100

Methods:

We surveyed three leeward reef sites at Pelorus Island (figure 1). At each site, four belt transects (1 m width, 20 m length) were surveyed on SCUBA at 4–6 m depth. Surficial death assemblages were collected by hand on SCUBA at eight points (n = ?40 fragments per point) at random across a single 20 m transect at each site. From these collections, fragments of the dominant genus/growth form present in death assemblages were identified, and samples were selected for U-series dating haphazardly (i.e. with no bias for taphonomic state of fragments). Sample fragments were sectioned laterally, and a sub-sample (2–3 g) of skeleton was taken from the cleanest section (i.e. unaffected by internal bioerosion) in closest proximity to the growth margin. Approximately 1 g of carefully cleaned material from each sub-sample was used for thermal ionization mass spectrometry (TIMS) and multi-collector inductively coupled plasma mass spectrometer (MC-ICPMS) U-series dating (Roff et al 2013 for more information)

Format of the data:

The dataset comprises of U-Th data obtained using thermal ionisation mass spectrometry (TIMS) and multi-collector inductively coupled plasma mass spectrometry (MC ICP-MS). Data is presented in a table in a word file () with values for uranium concentration (U ppm), 232Th concentration (ppb), measured 230Th/232Th (activity ratio), 230Th/238U (activity ratio), ?234U (activity ratio), uncorrected and corrected 230Th age (in years), time of chemistry (years AD) and corrected 230Th age (years AD).

References:

Roff et al (2013) Palaeoecological evidence of a historical collapse of corals at Pelorus Island, inshore Great Barrier Reef, following European settlement. Proceedings of the Royal Society Series B 10.1098/rspb.2012.2100

Data Location:

This dataset is filed in the eAtlas enduring data repository at: data\NERP-TE\1.3_Coral-cores

本数据集为佩洛鲁斯岛（Pelorus Island）的铀系（U-series）测年数据，相关研究来自Roff等人2013年发表于《英国皇家学会会报B辑》（Proceedings of the Royal Society Series B）的论文《欧洲殖民后大堡礁近岸佩洛鲁斯岛珊瑚历史崩溃的古生态学证据》，DOI:10.1098/rspb.2012.2100。

### 研究方法
本研究于佩洛鲁斯岛选取3个背风礁体站点（图1）。在每个站点，于4~6米水深通过水肺潜水（SCUBA）完成4条带状样带（宽度1米，长度20米）的调查。在每个站点的单条20米样带上，随机选取8个点位，手工采集表层死亡珊瑚组合（每个点位约采集40份珊瑚碎块）。从这些采集样本中，鉴定死亡组合中占优势的属类/生长型珊瑚碎块，并随机选取样本开展铀系测年（即不针对碎块的埋藏学状态设置偏倚）。将选定的珊瑚碎块横向切片，从最接近生长边缘且受内部生物侵蚀最少的清洁切片中获取2~3克的骨骼子样本。每个子样本中取约1克经精细清洁的材料，用于热电离质谱（thermal ionization mass spectrometry, TIMS）与多接收器电感耦合等离子体质谱（multi-collector inductively coupled plasma mass spectrometer, MC-ICPMS）铀系测年（详细方法参见Roff等2013年研究）。

### 数据格式
本数据集包含通过热电离质谱（TIMS）与多接收器电感耦合等离子体质谱（MC-ICPMS）获得的铀钍（U-Th）测年数据。数据以表格形式存储于Word文档中，包含以下参数：铀浓度（U ppm）、²³²Th浓度（ppb）、实测²³⁰Th/²³²Th活度比、²³⁰Th/²³⁸U活度比、δ²³⁴U活度比、未校正与已校正的²³⁰Th年龄（单位：年）、化学处理年份（公元纪年）以及校正后的²³⁰Th年龄（公元纪年）。

### 参考文献
Roff等（2013）：《欧洲殖民后大堡礁近岸佩洛鲁斯岛珊瑚历史崩溃的古生态学证据》，《英国皇家学会会报B辑》，DOI:10.1098/rspb.2012.2100。

### 数据存储位置
本数据集存档于eAtlas永久数据仓库，存储路径为：dataNERP-TE1.3_Coral-cores。