[dinosaur] Macroelongatoolithid eggs geochemistry from Late Cretaceous Xixia Basin, China

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Ben [email protected]=0A=0A=0AA new paper:=0A=0A=3D=3D=3D=3D=
=3D=3D=0A=0AQing He, Sen Yang, Songhai Jia, Li Xu, Lida Xing, Diansong Gao,=
 Di Liu,=0AYongli Gao & Yalin Zheng (2020)=0ATrace element and isotope geoc=
hemistry of macroelongatoolithid eggs as an=0Aindicator of palaeoenvironmen=
tal reconstruction from the Late Cretaceous=0AXixia Basin, China.=0ACretace=
ous Research: 104373 (advance online publication)=0Adoi: https://urldefense=
.proofpoint.com/v2/url?u=3Dhttps-3A__doi.org_10.1016_j.cretres.2020.104373&=
d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmG=
of_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3D2SbcTnQVqgl6kcd9QsixAOmXHfcKT3JJHNyPMuR=
VRBs&s=3DGWjatiIANi5B0nEIA82bPtteEk8MOsnQ9P1AulkuWgw&e=3D=20=0Ahttps://urld=
efense.proofpoint.com/v2/url?u=3Dhttps-3A__www.sciencedirect.com_science_ar=
ticle_pii_S0195667119303234&d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H=
8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3D2SbcTnQVqgl=
6kcd9QsixAOmXHfcKT3JJHNyPMuRVRBs&s=3DDoS4A4n-eHmlFIYt0FTaacbycQO7VngPBO_iCq=
97S_Y&e=3D=20=0A=0A=0AHighlights=0A=0AThe main mineral of dinosaur eggshell=
s in the Xixia Basin is calcite and=0Aminor quartz.=0ATwo trace elements (S=
r and Ir) of dinosaur eggshells in the Xixia Basin are=0Aabnormal in the ea=
rly Late Cretaceous.=0A=CE=B413C and =CE=B418O values of dinosaur eggshells=
 exhibit the C3 plants with low=0AMAP and high mean annual temperature.=0AT=
he geochemistry of dinosaur eggs and surrounding rocks in the Xixia Basin=
=0Ashow extremely arid climate in the Late Cretaceous.=0A=0AAbstract=0A=0AT=
he trace elements and isotopic compositions of macroelongatoolithid=0Aeggsh=
ells provide insights into the palaeoenvironment of these huge eggs=0Aprese=
rvation. We analysed the geochemical characteristics of newly=0Adiscovered =
macroelongatoolithid eggs from the early Cretaceous Zhaoying=0AFormation in=
 the Xixia Basin, Henan Province, China. X-ray diffraction=0Aresults reveal=
 that the minerals of these eggs are predominately composed=0Aof calcite. T=
he major elements in eggshells are Ca, Mg, K, Na, Al, Fe and=0ATi, and trac=
e elements mainly include Sr, Ba, Mn, La, As, Sc, V, Cr, Co,=0ANi, Cu, Pb, =
Zn, Cd, U, and Ir. The high Sr and Ir concentrations could be=0Acaused by f=
ood materials and drinking water of dinosaurs. =CE=B413C values of=0Aeggshe=
lls varying between -7.19=E2=80=B0 and -5.08=E2=80=B0 (average -5.69 =E2=80=
=B0) indicate the=0AC3 plants for dinosaurs with relatively high atmospheri=
c CO2 concentration=0Aand low mean annual precipitation (MAP); further rese=
arches show that the=0Acarbon isotopic composition of atmospheric CO2 was a=
round -4.11=E2=80=B0 to -2.19=E2=80=B0,=0Aand the MAP was lower than 10 mm/=
yr. =CE=B418O values varying between -5.72=E2=80=B0 and=0A-3.28=E2=80=B0 (a=
verage -4.53=E2=80=B0) show the temperature of nesting area were about=0A23=
=C2=B0C and the drinking water was dominated by leaf water with few meteori=
c=0Awater. The palaeoenvironment in which these huge eggs were preserved co=
uld=0Abe interpreted as continental deposit with extremely arid climate in =
the=0Aearly Late Cretaceous Xixia Basin based on the high Fe contents of=0A=
eggshells, the low palaeoclimate index of surrounding rocks, and the=0Aextr=
emely low MAP shown by oxygen isotope.=0A=

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<div dir=3D"ltr"><div><br></div>Ben Creisler<div><a href=3D"mailto:bcreisle=
[email protected]">[email protected]</a></div><div><br></div><div><br></div><di=
v>A new paper:<br><div><br></div><div>=3D=3D=3D=3D=3D=3D</div><div><br>Qing=
 He, Sen Yang, Songhai Jia, Li Xu, Lida Xing, Diansong Gao, Di Liu, Yongli =
Gao &amp; Yalin Zheng (2020)<br>Trace element and isotope geochemistry of m=
acroelongatoolithid eggs as an indicator of palaeoenvironmental reconstruct=
ion from the Late Cretaceous Xixia Basin, China.<br>Cretaceous Research: 10=
4373 (advance online publication)<br>doi: <a href=3D"https://urldefense.pro=
ofpoint.com/v2/url?u=3Dhttps-3A__doi.org_10.1016_j.cretres.2020.104373&amp;=
d=3DDwMFaQ&amp;c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&amp;r=3DRy_m=
O4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&amp;m=3D2SbcTnQVqgl6kcd9QsixAOmXHfc=
KT3JJHNyPMuRVRBs&amp;s=3DGWjatiIANi5B0nEIA82bPtteEk8MOsnQ9P1AulkuWgw&amp;e=
=3D">https://doi.org/10.1016/j.cretres.2020.104373</a> <br><a href=3D"https=
://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.sciencedirect.com_sci=
ence_article_pii_S0195667119303234&amp;d=3DDwMFaQ&amp;c=3DclK7kQUTWtAVEOVIg=
vi0NU5BOUHhpN0H8p7CSfnc_gI&amp;r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW=
9SI&amp;m=3D2SbcTnQVqgl6kcd9QsixAOmXHfcKT3JJHNyPMuRVRBs&amp;s=3DDoS4A4n-eHm=
lFIYt0FTaacbycQO7VngPBO_iCq97S_Y&amp;e=3D">https://www.sciencedirect.com/sc=
ience/article/pii/S0195667119303234</a><br><br><br>Highlights</div><div><br=
>The main mineral of dinosaur eggshells in the Xixia Basin is calcite and m=
inor quartz.<br>Two trace elements (Sr and Ir) of dinosaur eggshells in the=
 Xixia Basin are abnormal in the early Late Cretaceous.<br>=CE=B413C and =
=CE=B418O values of dinosaur eggshells exhibit the C3 plants with low MAP a=
nd high mean annual temperature.<br>The geochemistry of dinosaur eggs and s=
urrounding rocks in the Xixia Basin show extremely arid climate in the Late=
 Cretaceous.<br><br>Abstract</div><div><br>The trace elements and isotopic =
compositions of macroelongatoolithid eggshells provide insights into the pa=
laeoenvironment of these huge eggs preservation. We analysed the geochemica=
l characteristics of newly discovered macroelongatoolithid eggs from the ea=
rly Cretaceous Zhaoying Formation in the Xixia Basin, Henan Province, China=
. X-ray diffraction results reveal that the minerals of these eggs are pred=
ominately composed of calcite. The major elements in eggshells are Ca, Mg, =
K, Na, Al, Fe and Ti, and trace elements mainly include Sr, Ba, Mn, La, As,=
 Sc, V, Cr, Co, Ni, Cu, Pb, Zn, Cd, U, and Ir. The high Sr and Ir concentra=
tions could be caused by food materials and drinking water of dinosaurs. =
=CE=B413C values of eggshells varying between -7.19=E2=80=B0 and -5.08=E2=
=80=B0 (average -5.69 =E2=80=B0) indicate the C3 plants for dinosaurs with =
relatively high atmospheric CO2 concentration and low mean annual precipita=
tion (MAP); further researches show that the carbon isotopic composition of=
 atmospheric CO2 was around -4.11=E2=80=B0 to -2.19=E2=80=B0, and the MAP w=
as lower than 10 mm/yr. =CE=B418O values varying between -5.72=E2=80=B0 and=
 -3.28=E2=80=B0 (average -4.53=E2=80=B0) show the temperature of nesting ar=
ea were about 23=C2=B0C and the drinking water was dominated by leaf water =
with few meteoric water. The palaeoenvironment in which these huge eggs wer=
e preserved could be interpreted as continental deposit with extremely arid=
 climate in the early Late Cretaceous Xixia Basin based on the high Fe cont=
ents of eggshells, the low palaeoclimate index of surrounding rocks, and th=
e extremely low MAP shown by oxygen isotope.<br><br>	<br><br></div></div></=
div>=0A=

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