Carbonate geochemistry in BLC Lake over the last 5000 years

Carbonate geochemistry, including species, content, and isotopic compositions, in the Beilianchi (BLC) Lake, northern China, was obtained. Carbonate species were identified using X-ray diffraction (XRD) and results show that carbonate consists of proto-dolomite and calcite. The dolomite and calcite contents were determined by a Nicolet 6700 Fourier transform infrared reflectance (FTIR) with a diffuse reflectance attachment (Meng et al., 2015). The C-O isotopic compositions of bulk carbonate were determined using a Thermo-Fisher MAT 253 plus mass spectrometer equipped with a Kiel preparation system through the reaction with 100% phosphoric acid. The δ13C and δ18O results are reported relative to Vienna Pee Dee Belemnite (VPDB) standard. The analytical error for both the δ13C and δ18O is better than 0.1‰. This dataset can help to reconstruct the effective moisture change in northern China.本数据集获取了中国北部贝连池（Beilianchi, BLC）湖的碳酸盐地球化学数据，涵盖碳酸盐物种类别、含量及同位素组成。采用X射线衍射（X-ray diffraction, XRD）法鉴定碳酸盐物种类别，结果显示研究区碳酸盐矿物主要由准白云石（proto-dolomite）和方解石（calcite）组成。白云石与方解石的含量通过配备漫反射附件的Nicolet 6700型傅里叶变换红外反射光谱（FTIR）仪测定（Meng等，2015）。采用搭载Kiel制样系统的Thermo-Fisher MAT 253 plus型质谱仪，通过与100%磷酸反应的分析流程，测定了全岩碳酸盐的碳-氧同位素组成。δ13C与δ18O的测试结果均以维也纳佩德贝莱姆尼特（Vienna Pee Dee Belemnite, VPDB）标准为参照进行报告。δ13C与δ18O的分析误差均优于0.1‰。本数据集可用于反演中国北部地区的有效湿度变化历史。