Heidelberg University
Institute of Earth Sciences

Im Neuenheimer Feld 236
69120 Heidelberg

Phone: +49 6221 54-8206
Fax: +49 6221 54-4805


Isotope Geology and Petrology

Dr. Andreas HertwigHertwig Kl



Institute of Earth Sciences

Ruprecht-Karls-Universität Heidelberg

Im Neuenheimer Feld 236

D-69120 Heidelberg

Room: 511
+49 6221 54-8209
+49 6221 54-4805 (secretariat)



Research interests and projects


  • High-pressure metamorphism and fluid-rock interactions at subduction zones (jadeitite genesis in the serpentinite mélanges of the Rio San Juan Complex, Dominican Republic)
    • Current project funded by DFG: “In-situ U-Pb age dating and the oxygen isotopic composition of accessory minerals in jadeitites: investigating the timing of fluid release and fluid-rock interactions in subduction zones.”
  • Early solar system evolution (oxygen isotope analysis and Al-Mg chronology of chondrules and Ca-Al-rich inclusions in chondrites by SIMS)
  • Dating of accessory minerals by SIMS (e.g., zircon in jadeitites, apatite in meteorites)
  • Stable isotope paleoclimate proxies
  • High resolution determination of isotope ratios in minerals and other solid matter by secondary ion mass spectrometry (SIMS)


Academic career and professional employment


Since 10/2020 Heidelberg University, Research Associate
07/2018-08/2020 University of California, Los Angeles, Post-doctoral researcher
11/2015-06/2018 University of Wisconsin-Madison, Post-doctoral researcher
2014 Ruhr-Universität Bochum, Dissertation (Dr. rer. nat.)
2010 Technische Universität Berlin, Diplom




2015 Ruth Massenberg-Preis (Annual award for the best thesis in the field of natural sciences defended at the Ruhr-University Bochum)



Current teaching


2022 Summer semester

  • Polarized-light microscopy I (Lichtmikroskopie I, B. Sc.)
  • Field trip Fichtelgebirge/NE-Bavaria (B. Sc.)

2022/23 Winter semester:

  • Polarized-light microscopy II (Lichtmikroskopie II, B. Sc.)






MacPherson, G. J., Beckett, J., Kita, N. T., Nagashima, K., Krot, A. N., Fournelle, J., Kööp, L., Hertwig, A. T., Rose, T. R. & Davis, A. M. (2023). SIMS relative sensitivity factors for Al/Mg in synthetic and Madagascar hibonite. Chemical Geology, 617, 121272. DOI: 10.1016/j.chemgeo.2022.121272.


Cavole, L. M., Limburg, K. E., Gallo, N. D., Vea Salvanes, A. G., Ramírez-Valdez, A., Levin, L. A., Oropeza, O. A., Hertwig, A., Liu, M.-C. & McKeegan, K. D. (2023). Otoliths of marine fishes record evidence of low oxygen, temperature and pH conditions of deep Oxygen Minimum Zones. Deep Sea Research Part I: Oceanographic Research Papers, 191, 103941. DOI: 10.1016/j.dsr.2022.103941.





Fukuda, K., Tenner, T. J., Kimura, M., Tomioka, N., Siron, G., Ushikubo, T., Chaumard, N., Hertwig, A. T. & Kita, N. T. (2022). A temporal shift of chondrule generation from the inner to outer Solar System inferred from oxygen isotopes and Al-Mg chronology of chondrules from primitive CM and CO chondrites. Geochimica et Cosmochimica Acta, 322, 194-226. DOI: 10.1016/j.gca.2021.12.027.


Salazar-Jaramillo, S., Śliwiński, M. G., Hertwig, A. T., Garzón, C. C., Gómez, C. F., Bonilla, G. E. & Guerrero, J. (2022). Changes in rainfall seasonality inferred from weathering and pedogenic trends in mid-Miocene paleosols of La Tatacoa, Colombia. Global and Planetary Change, 208, 103711.


Dunham, E. T., Wadhwa, M., Desch, S. J., Liu, M. C., Fukuda, K., Kita, N., Hertwig, A. T., Hervig, R. L., Defouilloy, C., Simon, S. B., Davidson, J., Schrader, D. L. & Fujimoto, Y. (2022). Uniform initial 10Be/9Be inferred from refractory inclusions in CV3, CO3, CR2, and CH/CB chondrites. Geochimica et Cosmochimica Acta, 324, 194–220. DOI: 10.1016/j.gca.2022.02.002.




Hertwig, A., Maresch, W. V. & Schertl, H.-P. (2021). Jadeitite and related rocks in serpentinite mélanges from the Rio San Juan Complex, Dominican Republic: evidence for both isochemical replacement and metasomatic desilication of igneous protoliths with fluid-assisted jadeite growth. Russian Geology and Geophysics, 62, 496-524.


Hertwig, A. T., Liu, M.-C., Brearley, A. J. & Simon, S. B. (2021). Petrographic and isotopic investigations of two unusual Ca-Al-rich inclusions from primitive CO3 chondrites. Geochimica et Cosmochimica Acta, 296, 75-96. DOI: 10.1016/j.gca.2020.12.014.


Chaumard, N., Defouilloy, C, Hertwig, A. T. & Kita, N. T. (2021). Oxygen isotope systematics of chondrules in the Paris CM2 chondrite: Indication for a single large formation region across snow line. Geochimica et Cosmochimica Acta, 299, 199-218. DOI: 10.1016/j.gca.2021.02.012.


Knaf, A., Habiba, Shafie, T., Koornneef, J. M., Hertwig, A., Cárdenas-Párraga, J., García-Casco, A., Harlow, G. E., Schertl, H.-P., Maresch, W. V., López Belando, A. J., Hofman, C. L., Brandes, U. & Davies, G. R. (2021). Trace-elemental and multi-isotopic (Sr-Nd-Pb) discrimination of jade in the circum-Caribbean: Implications for pre-colonial inter-island exchange networks. Journal of Archaeological Science, 135, 105466. DOI: 10.1016/j.jas.2021.105466.




Han, J., Keller, L. P., Liu, M.-C., Needham, A. W., Hertwig, A. T., Messenger, S. & Simon, J. I. (2020). A Coordinated Microstructural and Isotopic Study of a Wark-Lovering Rim on a Vigarano CAI. Geochimica et Cosmochimica Acta, 269, 639-660. DOI: 10.1016/j.gca.2019.10.042.


Borrelli, C., Gabitov, R., Liu, M.-C., Hertwig, A. T. & Panieri, G. (2020). The benthic foraminiferal δ34S records intensity and timing of paleo methane fluxes. Scientific Reports, 10, 1304. DOI: 10.1038/s41598-020-58353-4.




Schertl, H.-P., Hertwig, A. & Maresch, W. V. (2019). Cathodoluminescence Microscopy of Zircon in HP- and UHP-Metamorphic Rocks: A Fundamental Technique for Assessing the Problem of Inclusions versus Pseudo-Inclusions. Journal of Earth Science, 30, 1095-1107. DOI: 10.1007/s12583-019-1246-5.


Harlow, G. E., Berman, M. J., Cárdenas Párraga, J., Hertwig, A., García-Casco, A. & Gnivecki, P. L.  (2019). Pre-Columbian jadeitite artifacts from San Salvador Island, Bahamas and comparison with jades of the eastern Caribbean and jadeitites of the greater Caribbean region. Journal of Archaeological Science, 26, 101830. DOI: 10.1016/j.jasrep.2019.04.019.


Liu, M.-C., Han, J., Brearley, A. J. & Hertwig, A. T. (2019). Aluminum-26 chronology of dust coagulation and early solar system evolution. Science Advances, 5, eaaw3350. DOI: 10.1126/sciadv.aaw3350.


Hertwig, A. T., Kimura, M., Defouilloy, C. & Kita, N. T. (2019). Oxygen isotope systematics of chondrule olivine, pyroxene, and plagioclase in one of the most pristine CV3-Red chondrites (Northwest Africa 8613). Meteoritics & Planetary Science, 54, 2666-2685. DOI: 10.1111/maps.13379.


Hertwig, A. T., Kimura, M., Ushikubo, T., Defouilloy, C. & Kita, N. T. (2019). The 26Al-26Mg systematics of FeO-rich chondrules from Acfer 094: two chondrule generations distinct in age and oxygen isotope ratios. Geochimica et Cosmochimica Acta, 253, 111-126. DOI: 10.1016/j.gca.2019.02.020.




Hertwig, A. T., Defouilloy, C. & Kita, N. T. (2018). Formation of chondrules in a moderately high dust enriched disk: Evidence from oxygen isotopes of chondrules from the Kaba CV3 chondrite. Geochimica et Cosmochimica Acta, 224, 116-131. DOI: 10.1016/j.gca.2017.12.013.


Schertl, H.-P., Maresch, W. V., Knippenberg, S., Hertwig, A., López Belando, A., Rodríguez Ramos, R., Speich, L. & Hofman, C. (2018). Petrography, mineralogy and geochemistry of jadeite-rich artefacts from the Playa Grande excavation site, northern Hispaniola: evaluation of local provenance from the Río San Juan Complex. In: Geological Society, London, Special Publications, SP474.3. DOI: 10.1144/SP474.3.


Kawamoto, T., Hertwig, A., Schertl, H.-P. & Maresch, W. V. (2018). Fluid inclusions in jadeitite and jadeite-rich rock from serpentinite mélanges in northern Hispaniola: Trapped ambient fluids in a cold subduction channel. Lithos, 308-309, 227-241. DOI: 10.1016/j.lithos.2018.02.024.




Hertwig, A., McClelland, W. C., Kitajima, K., Schertl, H.-P., Maresch, W. V., Stanek, K., Valley, J. W. & Sergeev, S. A. (2016). Inherited igneous zircons in jadeitite predate high-pressure metamorphism and jadeitite formation in the Jagua Clara serpentinite mélange of the Rio San Juan Complex (Dominican Republic). Contributions to Mineralogy and Petrology, 171, 48. DOI: 10.1007/s00410016-1256-6.




Hertwig, A., Maresch, W. V., Schertl, H.-P., Draper, G., Abbott, R. N. & López Belando, A. (2015). Field Guidebook to the XI International Eclogite Conference, Rio San Juan, Dominican Republic.




Schertl, H.-P., Maresch, W. V., Stanek, K. P., Hertwig, A., Krebs, M., Baese, R. & Sergeev, S. A. (2012). New occurrences of jadeitite, jadeite quartzite and jadeite-lawsonite quartzite in the Dominican Republic, Hispaniola: petrological and geochronological overview. European Journal of Mineralogy, 24, 199-216. DOI: 10.1127/0935-1221/2012/0024-2201.

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Latest Revision: 2023-01-12
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