onedz_datasets_csv This directory contains the split CSV datasets of the ZirconRegular_LLM project. All files are partitioned into manageable parts (~100,000–130,000 rows each) for batch processing, LLM ingestion, or memory-constrained workflows. ## Directory Structureonedz_datasets_csv/│├── Total_UPb_split_parts/              # Main U-Pb geochronology database│   ├── zircon_upb_part_01.csv│   ├── zircon_upb_part_02.csv│   └── ... (22 parts total)│├── Total_LuHf_split_parts/             # Lu-Hf isotope database, note that all files have been checked by experts│   ├── zircon_luhf_part_01.csv│   ├── zircon_luhf_part_02.csv│   └── zircon_luhf_part_03.csv│└── Experts_checked_UPb_split_parts/    # Expert-reviewed U-Pb subsets    ├── expert_upb_part_01.csv    ├── expert_upb_part_02.csv    └── ... (14 parts total)## Dataset Summary | Dataset | Parts | Est. Total Rows | Columns | Content ||---------|-------|-----------------|---------|---------|| Total_UPb_split_parts | 22 | ~2,550,000 | 64 | Full detrital zircon U-Pb age database || Total_LuHf_split_parts | 3 | ~297,000 | 33 | Lu-Hf isotope data linked to U-Pb records (expert-checked) || Experts_checked_UPb_split_parts | 14 | ~1,497,000 | 64 | Peer-reviewed regional compilations (quality-controlled) |--- ## File Format All CSV files follow the project standard:| Property | Specification ||----------|---------------|| Encoding | UTF-8 with BOM (utf-8-sig) || Delimiter | Comma (,) || Line endings | LF (\n) || Header | Single header row with standardized column names || Quoting | Double-quoted fields when containing commas or newlines | ### U-Pb Standard Columns (64 total) - Bibliographic: Lead_Author, Year, Journal, Vol, Pages, Title, Web_Link- Sample: Published_Sample_ID, Country_State, Region, Continent, Major_Geographic_Geologic_Unit, Minor_Geologic_Geographic_Unit, Group, Formation, Member, Locality, Profile, Latitude, Longitude- Depositional Age: Depos_Age_Period, Depos_Age_Epoch, Depos_Age_Stage, Max_Depos_Age_Ma, Est_Depos_Age_Ma, Min_Depos_Age_Ma- Analytical: Spectrometer, Spectrometer_Location, Institution, Spectrometer_Mode, Rock_Type_one, Rock_Type_two, Rock_Type_three, Grain, Spot_Location, Spot_diam- Isotope Ratios: Pb206U238_iso, Pb207U235_iso, Pb207Pb206_iso, Pb208Th232_iso (with one-sigma uncertainties)- Calculated Ages: Pb206U238_age, Pb207U235_age, Pb207Pb206_age, Best_age (with one- and two-sigma uncertainties), Discord- Elemental: U_ppm, Th_ppm, Pb_ppm, Pb206Pb204, Pb204Pb206, UTh_ratio, ThU_ratio ### Lu-Hf Columns (33 total) Includes all bibliographic and sample metadata columns above, plus:- Upb_Age, Upb_Age_two_sigma- 176Hf177Hf_iso, 176Lu177Hf_iso, 176Yb177Hf_iso (with 2-sigma uncertainties)- epsilon_Hf_0, epsilon_Hf_t (with 1-sigma and 2-sigma uncertainties)- TDM1_Ma, TDM2_Ma (with 2-sigma uncertainties)--- ## Usage Notes 1. Load order: When reassembling the full dataset, load parts in numerical order (01 → 22).2. Row overlap: Parts are split sequentially; no duplicate rows exist across parts of the same dataset.3. Cross-dataset linkage: Use Lead_Author + Year + Published_Sample_ID + Grain to link U-Pb records with Lu-Hf records.4. Expert vs. Total: Experts_checked_UPb_split_parts is a subset of the total database, curated from peer-reviewed regional compilations. It does not contain all rows from Total_UPb_split_parts.