| Abstrak/Abstract |
Speleothemmulti-proxy records have proved highly useful in reconstructing past changes in climatic and environmental
conditions aswell as karst processes, and in distinguishing between the numerous potential driving forces
that influence these proxies. There is lack of such terrestrial proxies from the tropical Indo-Pacific. For the first time,
we present an annual- to decadal-scale multi-proxy record of 377 samples including stable isotopes (?18O, ?13C)
and trace elements (Mg/Ca, Sr/Ca) from a Holocene calcite stalagmite from Bribin Cave, Gunung Kidul regency,
middle Java, Indonesia that has grown over the last 4000 years (11 230Th dates). ?18O values average ?7‰ with
high-frequency variability of up to 1‰, and hint at relatively stable overall climatic conditions in the tropical
Indo-Pacific region during the late Holocene. The ?13C values of stalagmite JB2 are low (~?13‰) at the beginning
of the record suggesting a C3-dominated rainforest cover. Strong positive covariationwithMg/Ca and Sr/Ca ratios
is a stringent indication of a dominant natural control by prior calcite precipitation and water–rock interaction.
However, ?13C values increase dramatically by ~4‰ from ~1.1 ka to ~0.5 ka, clear evidence of an anthropogenic
influence through deforestation and cultivation |
