There is no 6th element of chakra. It is mistaken that wood is the 6th element but Yamato states that wood is just earth and water.
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Naruto and fukasku can't merge because the Kyuubi's chakra rejects fukasaku's. Naruto and Fukasaku don't merge cause of the nine tailed fox's chakra.
The Fire Chakra element allows you to use Fire Element Jutsus.. Like the Fireball Jutsu..
naruto has huge amount of chakra he gets chakra :from the nine tailed fox
"Naruto: Outbreak" Shippuden #183 (I think it was called Naruto-Itis in english)
The nine tail fox chakra is very immense but it does not have an infinite supply.