00469nas a2200121 4500008004100000245011400041210006900155100001700224700002600241700001800267700001900285856004300304 2013 eng d00aShells from seagrass meadows and coral carpets: How isotopic signals can help to distinguish palaeohabitats 0 aShells from seagrass meadows and coral carpets How isotopic sign1 aReich, Sonja1 aWesselingh, Frank, P.1 aWarter, Viola1 aRenema, Willem uhttps://ipaeg.myspecies.info/node/206400509nas a2200145 4500008004100000245011600041210006900157300000800226490000600234100001700240700002600257700001800283700001900301856004300320 2013 eng d00aFaunal composition and isotopic signals of mollusk shells indicate seagrass meadows in the Miocene of Indonesia0 aFaunal composition and isotopic signals of mollusk shells indica a1690 v81 aReich, Sonja1 aWesselingh, Frank, P.1 aWarter, Viola1 aRenema, Willem uhttps://ipaeg.myspecies.info/node/206302508nas a2200133 4500008004100000245009600041210006900137260002200206520204200228100001802270700002202288700001902310856004502329 2013 eng d00aSub - annually resolved Miocene/Pliocene tropical palaeo - climate records from giant clams0 aSub annually resolved MiocenePliocene tropical palaeo climate re aBarcelonabSitges3 a

Changes in seasonality play an important role in regards to climate changes (e.g. Eldrett
et al.,
2009). To better characterize Miocene/Pliocene tropical climate and environmental change, it is
therefore crucial to reconstruct their variability on a seasonal scale. However, highly time resolve
d
palaeoenvironmental records which allow assessing
tropical intra
-
annual SST variability (like
ENSO or monsoon events) are rare, especially in 'deep
-
time'.
Here, we present high resolution
trace element and stable isotope proxy records from well
-
preserved aragonitic Late Miocene and
Pliocene
Tridacna
spp.
shells, sampled along the coast of East Kalimantan (Indonesia) and Sabah
(Malaysia), respectively. Our multi
-
proxy approach utilizes LA
-
ICPMS El/Ca ratios (e.g. Mg/Ca,
Sr/Ca, Ba/Ca) and micromilled stable isotope profiles (
δ
18
O,
δ
13
C).
Records obtained fr
om our
Miocene specimens show a remarkable agreement in Mg/Ca, Sr/Ca and
δ
18
O and can be aligned
with the shell banding pattern.
δ
18
O intra
-
annual variability indicates a palaeoseasonality of 3
-
4°C
(if interpreted as being temperature
-
controlled only). Ba/
Ca profiles from Pliocene tridacnin shells
are characterized by pronounced, episodically occurring peaks with a high intrashell
reproducibility. Very similar Ba/Ca signals found in modern
Tridacnagigas
have been interpreted
as palaeoproductivity indicators
(Elliot et al., 2009). Records of a modern
Tridacna
spp. from
Sabah are utilized for comparison and calibration purposes
.

1 aWarter, Viola1 aMüller, Wolfgang1 aRenema, Willem uhttp://www.icp2013.cat/USB/PDF/P-183.PDF