/* DATA DESCRIPTION: Citation: Rantala, Marttiina V; Israde-Alcántara, Isabel; Safaierad, Reza; Mattielli, Nadine; Tylmann, Wojciech; Smol, John P; Grooms, Christopher; Lepoint, Gilles; Francus, Pierre; Metcalfe, Sarah; Etmański, Paweł; Fagel, Nathalie (2026): Raw X-ray fluorescence core scanning (XRF-CS) data of a sediment core from Lake Alchichica (Puebla, Mexico) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.990165 Abstract: Raw X-ray fluorescence core scanning (XRF-CS) data of sediment core LAc22-1 retrieved from Lake Alchichica in April 2022. Scans were performed with a 2 mm step size and 20 seconds dwell time. The analysis yielded the ratio of Compton (incoherent) to Rayleigh (coherent) scattering (Inc/coh) that can be used as an indicator of sediment organic matter content. The measurements extend back to the late 1800s. Ages were estimated using Pb-210 dating and Bayesian age-depth modeling. Keyword(s): Anthropocene; biogeochemistry; Carbon accumulation; crater lake; Lake sediment; Mexico; Primary production; Tropical Supplement to: Rantala, Marttiina V; Israde-Alcántara, Isabel; Safaierad, Reza; Mattielli, Nadine; Tylmann, Wojciech; Smol, John P; Grooms, Christopher; Lepoint, Gilles; Francus, Pierre; Metcalfe, Sarah; Etmański, Paweł; Fagel, Nathalie (2026): Increasing lake primary production and organic carbon sequestration in tropical Mexican lakes during the past century. CATENA, 273, 110448, https://doi.org/10.1016/j.catena.2026.110448 References: Aquino-Lopez, Marco A; Blaauw, Maarten; Christen, Andrés; Sanderson, Nicole K (2018): Bayesian Analysis of 210Pb Dating. Journal of Agricultural Biological and Environmental Statistics, 23(3), 317-333, https://doi.org/10.1007/s13253-018-0328-7 Funding: Fonds de la Recherche Scientifique (FNRS), grant/award no. PDR T.0079.21: Holocene Mexican Crater Lakes and Climate (HolMeCl) Coverage: LATITUDE: 19.410556 * LONGITUDE: -97.403889 DATE/TIME START: 2022-04-12T00:00:00 * DATE/TIME END: 2022-04-12T00:00:00 MINIMUM DEPTH, sediment/rock: 0.000 m * MAXIMUM DEPTH, sediment/rock: 0.150 m Event(s): LAc22-1 * LATITUDE: 19.410556 * LONGITUDE: -97.403889 * DATE/TIME: 2022-04-12T00:00:00 * ELEVATION: 2322.0 m * LOCATION: Lake Alchichica, Puebla, Mexico * METHOD/DEVICE: Sediment corer, UWITEC Parameter(s): DEPTH, sediment/rock [m] (Depth sed) * GEOCODE * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) Age [a AD/CE] (Age) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: Bayesian age model, according to Aquino-López et al. (2018) (URI: https://doi.org/10.1007/s13253-018-0328-7) * COMMENT: Plum version 0.5.1 by Aquino-López et al. (2018, doi:10.1007/s13253-018-0328-7). AGE [ka BP] (Age) * GEOCODE * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) Silicon [cps] (Si) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Chlorine [cps] (Cl) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Potassium [cps] (K) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Calcium [cps] (Ca) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Titanium [cps] (Ti) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Chromium [cps] (Cr) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Manganese [cps] (Mn) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Iron [cps] (Fe) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Nickel [cps] (Ni) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Copper [cps] (Cu) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Germanium [cps] (Ge) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Strontium [cps] (Sr) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Zirconium [cps] (Zr) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Tantalum [cps] (Ta) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax Scattering ratio, incoherent/coherent (icoh/coh scat) * PI: Rantala, Marttiina V (https://orcid.org/0000-0002-3231-5926, marttiina.rantala@gmail.com) * METHOD/DEVICE: X-ray fluorescence core scanner (XRF), Cox Analytical Systems, Itrax License: Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) Status: Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels) Size: 1216 data points */ Depth sed [m] Age [a AD/CE] Age [ka BP] Si [cps] Cl [cps] K [cps] Ca [cps] Ti [cps] Cr [cps] Mn [cps] Fe [cps] Ni [cps] Cu [cps] Ge [cps] Sr [cps] Zr [cps] Ta [cps] icoh/coh scat 0.000 2022.30 -0.072300000 89 270 700 22706 433 229 729 23737 521 154 343 6224 427 895 8.41 0.002 2020.30 -0.070300000 99 251 712 27175 523 179 860 22855 570 230 279 7050 374 831 8.64 0.004 2018.40 -0.068400000 82 253 679 28657 622 234 799 22813 489 141 257 7664 393 881 7.86 0.006 2016.40 -0.066400000 89 318 774 30472 622 188 815 23500 520 182 376 7315 421 906 8.07 0.008 2014.50 -0.064500000 111 259 1007 33835 691 146 844 27311 479 330 210 7505 412 872 7.94 0.010 2012.60 -0.062600000 127 240 929 35093 736 153 884 26191 421 164 362 7741 462 699 8.25 0.012 2010.60 -0.060600000 102 221 974 35340 729 210 832 26756 425 175 310 7584 447 740 7.66 0.014 2008.60 -0.058600000 126 237 947 35155 672 212 899 26989 427 175 182 7444 533 739 7.73 0.016 2006.60 -0.056600000 182 232 905 30135 830 195 965 28538 461 246 108 6948 573 539 8.87 0.018 2004.70 -0.054700000 107 213 734 24665 705 203 820 23092 458 271 246 6136 385 631 8.38 0.020 2002.70 -0.052700000 89 212 735 24065 637 187 779 24649 468 278 243 6365 428 766 8.73 0.022 2000.70 -0.050700000 105 231 736 24851 703 147 739 24096 396 255 220 6367 488 730 8.53 0.024 1998.80 -0.048800000 131 226 707 26377 694 181 741 24569 477 182 312 6679 544 796 8.55 0.026 1996.90 -0.046900000 122 269 619 25616 685 196 716 22807 577 266 425 6648 488 786 8.55 0.028 1994.90 -0.044900000 115 213 679 25901 610 174 636 22052 525 214 188 6877 447 840 8.35 0.030 1993.00 -0.043000000 95 241 651 25561 611 163 599 21107 462 182 315 7172 344 809 9.25 0.032 1991.70 -0.041700000 124 213 613 27266 684 258 557 20990 537 261 195 6895 381 755 8.95 0.034 1990.40 -0.040400000 63 218 589 27864 614 167 595 20764 504 224 347 7263 545 803 9.14 0.036 1989.10 -0.039100000 115 210 726 28655 682 183 546 21643 432 264 412 7030 355 940 9.23 0.038 1987.80 -0.037800000 85 183 697 28708 623 143 587 21475 460 94 376 7476 444 845 8.50 0.040 1986.60 -0.036600000 79 199 713 27625 623 160 649 21079 485 117 264 7322 447 820 8.32 0.042 1985.00 -0.035000000 101 244 728 25933 695 186 646 21581 478 244 315 7211 518 715 8.74 0.044 1983.50 -0.033500000 98 244 657 25644 728 137 634 22402 415 172 240 7154 736 814 9.14 0.046 1982.00 -0.032000000 111 231 732 26956 718 164 586 22370 462 212 248 7158 400 877 8.52 0.048 1980.50 -0.030500000 112 241 723 28869 684 166 537 21408 428 254 147 7726 347 752 8.52 0.050 1979.00 -0.029000000 77 229 709 28028 627 216 600 21592 464 307 178 7446 488 625 8.37 0.052 1977.50 -0.027500000 79 193 639 25517 645 174 556 21528 450 218 278 7248 628 815 9.16 0.054 1975.90 -0.025900000 83 221 622 26078 640 167 562 21055 453 277 268 7494 455 723 8.66 0.056 1974.40 -0.024400000 100 222 618 26492 696 188 610 21047 423 254 179 7636 596 797 9.03 0.058 1972.80 -0.022800000 92 208 614 26398 691 175 536 19212 471 286 365 7985 408 645 8.55 0.060 1971.30 -0.021300000 133 226 607 23980 643 155 543 18380 523 253 323 7620 453 907 8.75 0.062 1969.50 -0.019500000 99 205 626 24226 643 135 532 19394 508 306 245 7648 560 677 8.63 0.064 1967.80 -0.017800000 126 229 590 23567 650 231 544 19792 511 232 398 7335 367 808 8.72 0.066 1966.00 -0.016000000 101 211 621 24487 699 181 505 18827 485 292 370 7274 399 738 9.42 0.068 1964.30 -0.014300000 111 226 644 25377 647 198 563 20241 524 307 188 7050 466 690 9.21 0.070 1962.50 -0.012500000 103 236 688 25830 702 207 518 21147 492 206 328 7113 299 853 9.41 0.072 1961.10 -0.011100000 86 165 642 25214 649 208 553 20327 418 221 347 7036 427 682 9.83 0.074 1959.70 -0.009700000 127 204 681 26217 661 197 577 21496 481 210 98 7160 558 730 8.38 0.076 1958.30 -0.008300000 87 203 696 28604 651 195 622 23064 533 214 430 7334 365 837 8.82 0.078 1956.90 -0.006900000 103 221 748 30102 761 146 658 22989 442 261 152 7767 458 774 9.05 0.080 1955.40 -0.005400000 131 231 746 33354 674 228 594 22361 590 252 360 8302 431 743 9.15 0.082 1953.60 -0.003600000 81 194 792 33350 696 162 555 22752 396 330 225 8039 409 633 8.24 0.084 1951.80 -0.001800000 107 209 747 31939 695 224 580 21724 450 331 221 8220 371 662 8.66 0.086 1950.00 0.000000000 154 213 683 30272 701 190 598 20424 487 244 318 7855 541 834 8.08 0.088 1948.10 0.001900000 70 196 619 31141 661 192 561 20765 470 240 423 8117 398 742 8.10 0.090 1946.30 0.003700000 127 190 635 32002 644 165 528 20256 416 249 158 8476 487 706 8.72 0.092 1944.20 0.005800000 84 195 617 34732 603 141 525 19063 484 180 406 8624 509 726 8.34 0.094 1942.10 0.007900000 114 188 719 33344 557 229 499 19929 492 214 290 8390 602 674 8.79 0.096 1940.00 0.010000000 113 179 607 30422 555 172 499 17581 513 245 195 8200 418 781 8.84 0.098 1937.90 0.012100000 96 198 529 30047 492 239 516 17962 473 231 232 8245 525 830 9.02 0.100 1935.80 0.014200000 114 167 698 32837 668 183 534 21329 482 195 188 8071 597 822 9.00 0.102 1933.30 0.016700000 106 185 632 31166 568 158 552 18324 500 231 156 8043 606 898 9.02 0.104 1930.90 0.019100000 121 189 572 30005 524 123 527 16631 509 252 290 7793 405 736 8.83 0.106 1928.40 0.021600000 115 188 494 27423 522 165 527 15862 517 410 233 7782 424 769 9.06 0.108 1925.90 0.024100000 89 200 520 28984 576 171 556 16946 586 224 331 7856 482 780 8.52 0.110 1923.50 0.026500000 92 182 588 28745 538 246 506 17341 547 272 253 8132 474 702 7.80 0.112 1921.00 0.029000000 112 206 624 30244 608 182 528 18223 465 170 345 7886 467 846 9.32 0.114 1918.50 0.031500000 111 213 563 31172 588 167 496 18434 525 161 345 8220 404 876 8.70 0.116 1916.00 0.034000000 104 198 578 31735 580 168 536 17965 543 281 224 7884 342 722 9.05 0.118 1913.50 0.036500000 58 187 651 31071 593 204 483 18571 465 233 364 7930 381 791 8.54 0.120 1911.00 0.039000000 67 172 620 30586 600 196 508 18903 542 147 278 8061 294 809 9.14 0.122 1908.50 0.041500000 88 190 545 29486 586 151 573 18370 507 295 348 7644 353 851 9.18 0.124 1905.90 0.044100000 104 180 635 28394 579 253 605 18761 531 265 280 7615 377 812 8.38 0.126 1903.30 0.046700000 137 179 652 28247 619 181 623 20867 421 308 187 7669 520 769 8.83 0.128 1900.70 0.049300000 73 143 570 30076 664 169 653 20494 476 215 330 7770 360 779 8.86 0.130 1898.10 0.051900000 88 210 654 31513 485 154 550 19155 604 337 424 7803 473 643 9.39 0.132 1895.50 0.054500000 68 168 614 31461 588 183 547 19523 452 355 464 8120 553 666 8.67 0.134 1892.90 0.057100000 138 184 516 29962 639 212 609 17972 493 265 378 8120 563 854 8.36 0.136 1890.30 0.059698701 94 163 533 29644 641 222 636 18188 572 265 187 7917 436 848 8.16 0.138 1887.70 0.062296104 136 167 548 31020 585 198 579 19571 508 276 307 7943 502 650 7.92 0.140 1885.11 0.064893506 81 211 643 31302 603 203 670 21355 415 255 116 7920 603 709 8.56 0.142 1882.51 0.067490909 76 141 666 32793 643 156 543 20254 452 241 182 7892 370 775 8.50 0.144 1879.91 0.070088312 63 169 708 31763 619 161 566 21115 492 288 325 7851 545 586 8.37 0.146 1877.31 0.072685714 116 187 736 31797 614 204 604 21958 484 271 221 8107 395 807 8.31 0.148 1874.72 0.075283117 92 164 710 30262 603 162 530 21006 495 310 208 7734 440 660 8.28 0.150 1872.12 0.077880519 95 160 780 30579 592 167 563 20938 445 353 261 7654 313 608 8.57