Houxiang Shan

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Questions related from Houxiang Shan

Elevated δ18O signals can only screen out recycling of altered surficial rocks at specific paleo latitudes?

It is generally considered that significant deviations of zircon δ18O values from the mantle value directly or indirectly result from intra-crustal recycling. Intra-crustal recycling is defined as...

14 February 2016 6,944 2 View

Can Archean anorthosites indicate the unusually high Archean geothermal gradient?

As massif type anorthosites are in fact characteristic of Proterozoic time, not Archaean, and the Archaean anorthosites are quite different. So I am not sure whether Archean anorthosites can...

27 January 2016 4,064 5 View

Can we simply attribute "angular with irregular shape" of zircon to "relatively short-distance transportation and weak rounding"?

1. I once attributed "angular with irregular shape" of zircon to "relatively short-distance transportation and weak rounding". However, now I think the crushing procedure is very likely to produce...

30 May 2015 9,001 10 View

What's the difference of Hf isotopes between magmatic zircons and metamorphic zircons?

Can we say that for a single sample, metamorphic zircon domains yield lower 176Lu/177Hf ratios but higher εHf (t) values than magmatic domains? Is it suitable for all kinds of rocks? I ask this...

01 May 2015 6,517 8 View

Can anyone recommend some authoritative and useful element indicators to identify absence of crust contamination/assimilation in the basaltic magma?

I have known some indicators, like negative Zr anomalies, low Th, Zr and LREE contents, low La/Sm, (Th/Ta)N, Th/La and high Nb/La ratios. But I don’t know whether these are sufficient and robust...

04 February 2015 2,943 8 View